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bluetooth speakers.

7 months, 2 weeks ago by WillNorris?


SCRUM tools.

8 months, 1 week ago by WillNorris?

hosted-only services


Hold Me Now.

9 months, 3 weeks ago by WillNorris?
Hold_Me_Now.mid
I have a picture, pinned to my wall. An image of you and of me and we're laughing and loving it all. Look at our life now, tattered and torn. We fuss and we fight and delight in the tears that we cry until dawn

Hold me now, warm my heart stay with me, let loving start (let loving start)

You say I'm a dreamer, we're two of a kind Both of us searching for some perfect world we know we'll never find So perhaps I should leave here, yeah-ah go far away But you know that there's nowhere that I'd rather be than with you here today

[Chorus]

You ask if I love you, well what can I say? You know that I do and if this is just one of those games that we play So I'll sing you a new song, please don't cry anymore and then I'll ask your forgiveness, though I don't know just what I'm asking it for

[Chorus]

… reply

linux command line reference for common operations.

10 months, 3 days ago by WillNorris?
(http://www.pixelbeat.org/cmdline.html)

CommandDescription
•apropos whatisShow commands pertinent to string. See also threadsafe
•man -t ascii | ps2pdf - > ascii.pdfmake a pdf of a manual page
 which commandShow full path name of command
 time commandSee how long a command takes
•time catStart stopwatch. Ctrl-d to stop. See also sw
dir navigation
•cd -Go to previous directory
•cdGo to $HOME directory
 (cd dir && command)Go to dir, execute command and return to current dir
•pushd .Put current dir on stack so you can popd back to it
•alias l='ls -l --color=auto'quick dir listing
•ls -lrtList files by date. See also newest and find_mm_yyyy
•ls /usr/bin | pr -T9 -W$COLUMNSPrint in 9 columns to width of terminal
 find -name '*.[ch]' | xargs grep -E 'expr'Search 'expr' in this dir and below. See also findrepo
 find -type f -print0 | xargs -r0 grep -F 'example'Search all regular files for 'example' in this dir and below
 find -maxdepth 1 -type f | xargs grep -F 'example'Search all regular files for 'example' in this dir
 find -maxdepth 1 -type d | while read dir; do echo $dir; echo cmd2; doneProcess each item with multiple commands (in while loop)
•find -type f ! -perm -444Find files not readable by all (useful for web site)
•find -type d ! -perm -111Find dirs not accessible by all (useful for web site)
•locate -r 'file[^/]*\.txt'Search cached index for names. This re is like glob file.txt
•look referenceQuickly search (sorted) dictionary for prefix
•grep --color reference /usr/share/dict/wordsHighlight occurances of regular expression in dictionary
archives and compression
 gpg -c fileEncrypt file
 gpg file.gpgDecrypt file
 tar -c dir/ | bzip2 > dir.tar.bz2Make compressed archive of dir/
 bzip2 -dc dir.tar.bz2 | tar -xExtract archive (use gzip instead of bzip2 for tar.gz files)
 tar -c dir/ | gzip | gpg -c | ssh user@remote 'dd of=dir.tar.gz.gpg'Make encrypted archive of dir/ on remote machine
 find dir/ -name '*.txt' | tar -c --files-from=- | bzip2 > dir_txt.tar.bz2Make archive of subset of dir/ and below
 find dir/ -name '*.txt' | xargs cp -a --target-directory=dir_txt/ --parentsMake copy of subset of dir/ and below
 ( tar -c /dir/to/copy ) | ( cd /where/to/ && tar -x -p )Copy (with permissions) copy/ dir to /where/to/ dir
 ( cd /dir/to/copy && tar -c . ) | ( cd /where/to/ && tar -x -p )Copy (with permissions) contents of copy/ dir to /where/to/
 ( tar -c /dir/to/copy ) | ssh -C user@remote 'cd /where/to/ && tar -x -p' Copy (with permissions) copy/ dir to remote:/where/to/ dir
 dd bs=1M if=/dev/sda | gzip | ssh user@remote 'dd of=sda.gz'Backup harddisk to remote machine
rsync (Network efficient file copier: Use the --dry-run option for testing)
 rsync -P rsync://rsync.server.com/path/to/file fileOnly get diffs. Do multiple times for troublesome downloads
 rsync --bwlimit=1000 fromfile tofileLocally copy with rate limit. It's like nice for I/O
 rsync -az -e ssh --delete ~/public_html/ remote.com:'~/public_html'Mirror web site (using compression and encryption)
 rsync -auz -e ssh remote:/dir/ . && rsync -auz -e ssh . remote:/dir/Synchronize current directory with remote one
ssh (Secure SHell)
 ssh $USER@$HOST commandRun command on $HOST as $USER (default command=shell)
•ssh -f -Y $USER@$HOSTNAME xeyesRun GUI command on $HOSTNAME as $USER
 scp -p -r $USER@$HOST: file dir/Copy with permissions to $USER's home directory on $HOST
 scp -c arcfour $USER@$LANHOST: bigfileUse faster crypto for local LAN. This might saturate GigE
 ssh -g -L 8080:localhost:80 root@$HOSTForward connections to $HOSTNAME:8080 out to $HOST:80
 ssh -R 1434:imap:143 root@$HOSTForward connections from $HOST:1434 in to imap:143
 ssh-copy-id $USER@$HOST Install public key for $USER@$HOST for password-less log in
wget (multi purpose download tool)
•(cd dir/ && wget -nd -pHEKk http://www.pixelbeat.org/cmdline.html)Store local browsable version of a page to the current dir
 wget -c http://www.example.com/large.fileContinue downloading a partially downloaded file
 wget -r -nd -np -l1 -A '*.jpg' http://www.example.com/dir/Download a set of files to the current directory
 wget ftp://remote/file[1-9].iso/FTP supports globbing directly
•wget -q -O- http://www.pixelbeat.org/timeline.html | grep 'a href' | headProcess output directly
 echo 'wget url' | at 01:00Download url at 1AM to current dir
 wget --limit-rate=20k urlDo a low priority download (limit to 20KB/s in this case)
 wget -nv --spider --force-html -i bookmarks.htmlCheck links in a file
 wget --mirror http://www.example.com/Efficiently update a local copy of a site (handy from cron)
networking (Note ifconfig, route, mii-tool, nslookup commands are obsolete)
 ethtool eth0Show status of ethernet interface eth0
 ethtool --change eth0 autoneg off speed 100 duplex fullManually set ethernet interface speed
 iwconfig eth1Show status of wireless interface eth1
 iwconfig eth1 rate 1Mb/s fixedManually set wireless interface speed
•iwlist scanList wireless networks in range
•ip link showList network interfaces
 ip link set dev eth0 name wanRename interface eth0 to wan
 ip link set dev eth0 upBring interface eth0 up (or down)
•ip addr showList addresses for interfaces
 ip addr add 1.2.3.4/24 brd + dev eth0Add (or del) ip and mask (255.255.255.0)
•ip route showList routing table
 ip route add default via 1.2.3.254Set default gateway to 1.2.3.254
•host pixelbeat.orgLookup DNS ip address for name or vice versa
•hostname -iLookup local ip address (equivalent to host `hostname`)
•whois pixelbeat.orgLookup whois info for hostname or ip address
•netstat -tuplList internet services on a system
•netstat -tupList active connections to/from system
windows networking (Note samba is the package that provides all this windows specific networking support)
•smbtreeFind windows machines. See also findsmb
 nmblookup -A 1.2.3.4Find the windows (netbios) name associated with ip address
 smbclient -L windows_boxList shares on windows machine or samba server
 mount -t smbfs -o fmask=666,guest //windows_box/share /mnt/shareMount a windows share
 echo 'message' | smbclient -M windows_boxSend popup to windows machine (off by default in XP sp2)
text manipulation (Note sed uses stdin and stdout. Newer versions support inplace editing with the -i option)
 sed 's/string1/string2/g'Replace string1 with string2
 sed 's/\(.*\)1/\12/g'Modify anystring1 to anystring2
 sed '/ *#/d; /^ *$/d'Remove comments and blank lines
 sed ':a; /\\$/N; s/\\\n//; ta'Concatenate lines with trailing \
 sed 's/[ \t]*$//'Remove trailing spaces from lines
 sed 's/\([`"$\]\)/\\\1/g'Escape shell metacharacters active within double quotes
•seq 10 | sed "s/^/      /; s/ *\(.\{7,\}\)/\1/"Right align numbers
 sed -n '1000{p;q}'Print 1000th line
 sed -n '10,20p;20q'Print lines 10 to 20
 sed -n 's/.*<title>\(.*\)<\/title>.*/\1/ip;T;q'Extract title from HTML web page
 sed -i 42d ~/.ssh/known_hostsDelete a particular line
 sort -t. -k1,1n -k2,2n -k3,3n -k4,4nSort IPV4 ip addresses
•echo 'Test' | tr '[:lower:]' '[:upper:]'Case conversion
•tr -dc '[:print:]' < /dev/urandomFilter non printable characters
•tr -s '[:blank:]' '\t' </proc/diskstats | cut -f4cut fields separated by blanks
•history | wc -lCount lines
set operations (Note you can export LANG=C for speed. Also these assume no duplicate lines within a file)
 sort file1 file2 | uniqUnion of unsorted files
 sort file1 file2 | uniq -dIntersection of unsorted files
 sort file1 file1 file2 | uniq -uDifference of unsorted files
 sort file1 file2 | uniq -uSymmetric Difference of unsorted files
 join -t'\0' -a1 -a2 file1 file2Union of sorted files
 join -t'\0' file1 file2Intersection of sorted files
 join -t'\0' -v2 file1 file2Difference of sorted files
 join -t'\0' -v1 -v2 file1 file2Symmetric Difference of sorted files
math
•echo '(1 + sqrt(5))/2' | bc -lQuick math (Calculate φ). See also bc
•seq -f '4/%g' 1 2 99999 | paste -sd-+ | bc -lCalculate π the unix way
•echo 'pad=20; min=64; (100*10^6)/((pad+min)*8)' | bcMore complex (int) e.g. This shows max FastE packet rate
•echo 'pad=20; min=64; print (100E6)/((pad+min)*8)' | pythonPython handles scientific notation
•echo 'pad=20; plot [64:1518] (100*10**6)/((pad+x)*8)' | gnuplot -persistPlot FastE packet rate vs packet size
•echo 'obase=16; ibase=10; 64206' | bcBase conversion (decimal to hexadecimal)
•echo $((0x2dec))Base conversion (hex to dec) ((shell arithmetic expansion))
•units -t '100m/9.58s' 'miles/hour'Unit conversion (metric to imperial)
•units -t '500GB' 'GiB'Unit conversion (SI to IEC prefixes)
•units -t '1 googol'Definition lookup
•seq 100 | (tr '\n' +; echo 0) | bcAdd a column of numbers. See also add and funcpy
calendar
•cal -3Display a calendar
•cal 9 1752Display a calendar for a particular month year
•date -d friWhat date is it this friday. See also day
•[ $(date -d "tomorrow" +%d) = "01" ] || exitexit a script unless it's the last day of the month
•date --date='25 Dec' +%AWhat day does xmas fall on, this year
•date --date='@2147483647'Convert seconds since the epoch (1970-01-01 UTC) to date
•TZ='America/Los_Angeles' dateWhat time is it on west coast of US (use tzselect to find TZ)
•date --date='TZ="America/Los_Angeles" 09:00 next Fri'What's the local time for 9AM next Friday on west coast US
locales
•printf "%'d\n" 1234Print number with thousands grouping appropriate to locale
•BLOCK_SIZE=\'1 ls -lUse locale thousands grouping in ls. See also l
•echo "I live in `locale territory`"Extract info from locale database
•LANG=en_IE.utf8 locale int_prefixLookup locale info for specific country. See also ccodes
•locale -kc $(locale | sed -n 's/\(LC_.\{4,\}\)=.*/\1/p') | lessList fields available in locale database
recode (Obsoletes iconv, dos2unix, unix2dos)
•recode -l | lessShow available conversions (aliases on each line)
 recode windows-1252.. file_to_change.txtWindows "ansi" to local charset (auto does CRLF conversion)
 recode utf-8/CRLF.. file_to_change.txtWindows utf8 to local charset
 recode iso-8859-15..utf8 file_to_change.txtLatin9 (western europe) to utf8
 recode ../b64 < file.txt > file.b64Base64 encode
 recode /qp.. < file.qp > file.txtQuoted printable decode
 recode ..HTML < file.txt > file.htmlText to HTML
•recode -lf windows-1252 | grep euroLookup table of characters
•echo -n 0x80 | recode latin-9/x1..dumpShow what a code represents in latin-9 charmap
•echo -n 0x20AC | recode ucs-2/x2..latin-9/xShow latin-9 encoding
•echo -n 0x20AC | recode ucs-2/x2..utf-8/xShow utf-8 encoding
CDs
 gzip < /dev/cdrom > cdrom.iso.gzSave copy of data cdrom
 mkisofs -V LABEL -r dir | gzip > cdrom.iso.gzCreate cdrom image from contents of dir
 mount -o loop cdrom.iso /mnt/dirMount the cdrom image at /mnt/dir (read only)
 cdrecord -v dev=/dev/cdrom blank=fastClear a CDRW
 gzip -dc cdrom.iso.gz | cdrecord -v dev=/dev/cdrom -Burn cdrom image (use dev=ATAPI -scanbus to confirm dev)
 cdparanoia -BRip audio tracks from CD to wav files in current dir
 cdrecord -v dev=/dev/cdrom -audio -pad *.wavMake audio CD from all wavs in current dir (see also cdrdao)
 oggenc --tracknum='track' track.cdda.wav -o 'track.ogg'Make ogg file from wav file
disk space (See also FSlint)
•ls -lSrShow files by size, biggest last
•du -s * | sort -k1,1rn | headShow top disk users in current dir. See also dutop
•du -hs /home/* | sort -k1,1hSort paths by easy to interpret disk usage
•df -hShow free space on mounted filesystems
•df -iShow free inodes on mounted filesystems
•fdisk -lShow disks partitions sizes and types (run as root)
•rpm -q -a --qf '{SIZE}\t%{NAME}\n' | sort -k1,1nList all packages by installed size (Bytes) on rpm distros
•dpkg-query -W -f='${Installed-Size;10}\t${Package}\n' | sort -k1,1nList all packages by installed size (KBytes) on deb distros
•dd bs=1 seek=2TB if=/dev/null of=ext3.testCreate a large test file (taking no space). See also truncate
•> filetruncate data of file or create an empty file
monitoring/debugging
•tail -f /var/log/messagesMonitor messages in a log file
•strace -c ls >/dev/nullSummarise/profile system calls made by command
•strace -f -e open ls >/dev/nullList system calls made by command
•strace -f -e trace=write -e write=1,2 ls >/dev/nullMonitor what's written to stdout and stderr
•ltrace -f -e getenv ls >/dev/nullList library calls made by command
•lsof -p $$List paths that process id has open
•lsof ~List processes that have specified path open
•tcpdump not port 22Show network traffic except ssh. See also tcpdump_not_me
•ps -e -o pid,args --forestList processes in a hierarchy
•ps -e -o pcpu,cpu,nice,state,cputime,args --sort pcpu | sed '/^ 0.0 /d'List processes by % cpu usage
•ps -e -orss=,args= | sort -b -k1,1n | pr -TW$COLUMNSList processes by mem (KB) usage. See also ps_mem.py
•ps -C firefox-bin -L -o pid,tid,pcpu,stateList all threads for a particular process
•ps -p 1,$$ -o etime=List elapsed wall time for particular process IDs
•last rebootShow system reboot history
•free -mShow amount of (remaining) RAM (-m displays in MB)
•watch -n.1 'cat /proc/interrupts'Watch changeable data continuously
•udevadm monitorMonitor udev events to help configure rules
system information (see also sysinfo) ('#' means root access is required)
•uname -aShow kernel version and system architecture
•head -n1 /etc/issueShow name and version of distribution
•cat /proc/partitionsShow all partitions registered on the system
•grep MemTotal /proc/meminfoShow RAM total seen by the system
•grep "model name" /proc/cpuinfoShow CPU(s) info
•lspci -tvShow PCI info
•lsusb -tvShow USB info
•mount | column -tList mounted filesystems on the system (and align output)
•grep -F capacity: /proc/acpi/battery/BAT0/infoShow state of cells in laptop battery
#dmidecode -q | lessDisplay SMBIOS/DMI information
#smartctl -A /dev/sda | grep Power_On_HoursHow long has this disk (system) been powered on in total
#hdparm -i /dev/sdaShow info about disk sda
#hdparm -tT /dev/sdaDo a read speed test on disk sda
#badblocks -s /dev/sdaTest for unreadable blocks on disk sda
interactive (see also linux keyboard shortcuts)
•readlineLine editor used by bash, python, bc, gnuplot, ...
•screenVirtual terminals with detach capability, ...
•mcPowerful file manager that can browse rpm, tar, ftp, ssh, ...
•gnuplotInteractive/scriptable graphing
•linksWeb browser
•xdg-open .open a file or url with the registered desktop application

CommandDescription
•grep . /proc/sys/net/ipv4/*List the contents of flag files
•set | grep $USERSearch current environment
•tr '\0' '\n' < /proc/$$/environDisplay the startup environment for any process
•echo $PATH | tr : '\n'Display the $PATH one per line
•kill -0 $$ && echo process exists and can accept signalsCheck for the existence of a process (pid)
•find /etc -readable | xargs less -K -p'*ntp' -j $((${LINES:-25}/2))Search paths and data with full context. Use n to iterate
Low impact admin
#apt-get install "package" -o Acquire::http::Dl-Limit=42 \
-o Acquire::Queue-mode=access		Rate limit apt-get to 42KB/s
 echo 'wget url' | at 01:00Download url at 1AM to current dir
#apache2ctl configtest && apache2ctl gracefulRestart apache if config is OK
•nice openssl speed sha1Run a low priority command (openssl benchmark)
•renice 19 -p $$; ionice -c3 -p $$Make shell (script) low priority. Use for non interactive tasks
Interactive monitoring
•watch -t -n1 uptimeClock with system load
•htop -d 5Better top (scrollable, tree view, lsof/strace integration, ...)
•iotopWhat's doing I/O
#watch -d -n30 "nice ps_mem.py | tail -n $((${LINES:-12}-2))"What's using RAM
#iftopWhat's using the network. See also iptraf
#mtr www.pixelbeat.orgping and traceroute combined
Useful utilities
•pv < /dev/zero > /dev/nullProgress Viewer for data copying from files and pipes
•wkhtml2pdf http://.../linux_commands.html linux_commands.pdfMake a pdf of a web page
•timeout 1 sleep 3run a command with bounded time. See also timeout
Networking
•python -m SimpleHTTPServerServe current directory tree at http://$HOSTNAME:8000/
•openssl s_client -connect www.google.com:443 </dev/null 2>&0 |
openssl x509 -dates -noout		Display the date range for a site's certs
•curl -I www.pixelbeat.orgDisplay the server headers for a web site
#lsof -i tcp:80What's using port 80
#httpd -SDisplay a list of apache virtual hosts
•vim scp://user@remote//path/to/fileEdit remote file using local vim. Good for high latency links
•curl -s http://www.pixelbeat.org/pixelbeat.asc | gpg --importImport a gpg key from the web
•tc qdisc add dev lo root handle 1:0 netem delay 20msecAdd 20ms latency to loopback device (for testing)
•tc qdisc del dev lo rootRemove latency added above
Notification
•echo "DISPLAY=$DISPLAY xmessage cooker" | at "NOW +30min"Popup reminder
•notify-send "subject" "message"Display a gnome popup notification
 echo "mail -s 'go home' P@draigBrady.com < /dev/null" | at 17:30Email reminder
 uuencode file name | mail -s subject P@draigBrady.comSend a file via email
 ansi2html.sh | mail -a "Content-Type: text/html" P@draigBrady.comSend/Generate HTML email
Better default settings (useful in your .bashrc)
#tail -s.1 -f /var/log/messagesDisplay file additions more responsively
•seq 100 | tail -n $((${LINES:-12}-2))Display as many lines as possible without scrolling
#tcpdump -s0Capture full network packets
Useful functions/aliases (useful in your .bashrc)
•md () { mkdir -p "$1" && cd "$1"; }Change to a new directory
•strerror() { python -c "import os; print os.strerror($1)"; }Display the meaning of an errno
•plot() { { echo 'plot "-"' "$@"; cat; } | gnuplot -persist; }Plot stdin. (e.g: • seq 1000 | sed 's/.*/s(&)/' | bc -l | plot)
•hili() { e="$1"; shift; grep --col=always -Eih "$e|$" "$@"; }highlight occurences of expr. (e.g: • env | hili $USER)
•alias hd='od -Ax -tx1z -v'Hexdump. (usage e.g.: • hd /proc/self/cmdline | less)
•alias realpath='readlink -f'Canonicalize path. (usage e.g.: • realpath ~/../$USER)
Multimedia
•DISPLAY=:0.0 import -window root orig.pngTake a (remote) screenshot
•convert -filter catrom -resize '600x>' orig.png 600px_wide.pngShrink to width, computer gen images or screenshots
 mplayer -ao pcm -vo null -vc dummy /tmp/Flash*Extract audio from flash video to audiodump.wav
 ffmpeg -i filename.aviDisplay info about multimedia file
•ffmpeg -f x11grab -s xga -r 25 -i :0 -sameq demo.mpgCapture video of an X display
DVD
 for i in $(seq 9); do ffmpeg -i $i.avi -target pal-dvd $i.mpg; doneConvert video to the correct encoding and aspect for DVD
 dvdauthor -odvd -t -v "pal,4:3,720xfull" *.mpg;dvdauthor -odvd -TBuild DVD file system. Use 16:9 for widescreen input
 growisofs -dvd-compat -Z /dev/dvd -dvd-video dvdBurn DVD file system to disc
Unicode
•python -c "import unicodedata as u; print u.name(unichr(0x2028))"Lookup a unicode character
•uconv -f utf8 -t utf8 -x nfcNormalize combining characters
•printf '\300\200' | iconv -futf8 -tutf8 >/dev/nullValidate UTF-8
•printf 'ŨTF8\n' | LANG=C grep --color=always '[^ -~]\+'Highlight non printable ASCII chars in UTF-8
•fc-match -s "sans:lang=zh"List font match order for language and style
Development
•gcc -march=native -E -v -</dev/null 2>&1|sed -n 's/.*-mar/-mar/p'Show autodetected gcc tuning params. See also gcccpuopt
•for i in $(seq 4); do { [ $i = 1 ] && wget http://url.ie/6lko -qO-||
./a.out; } | tee /dev/tty | gcc -xc - 2>/dev/null; done		Compile and execute C code from stdin
•cpp -dM /dev/nullShow all predefined macros
•echo "#include <features.h>" | cpp -dN | grep "#define __USE_"Show all glibc feature macros
 gdb -tuiDebug showing source code context in separate windows
Extended Attributes (Note you may need to (re)mount with "acl" or "user_xattr" options)
•getfacl .Show ACLs for file
•setfacl -m u:nobody:r .Allow a specific user to read file
•setfacl -x u:nobody .Delete a specific user's rights to file
 setfacl --default -m group:users:rw- dir/Set umask for a for a specific dir
 getcap fileShow capabilities for a program
 setcap cap_net_raw+ep your_gtk_progAllow gtk program raw access to network
•stat -c%C .Show SELinux context for file
 chcon ... fileSet SELinux context for file (see also restorecon)
•getfattr -m- -d .Show all extended attributes (includes selinux,acls,...)
•setfattr -n "user.foo" -v "bar" .Set arbitrary user attributes
BASH specific
•echo 123 | tee >(tr 1 a) | tr 1 bSplit data to 2 commands (using process substitution)
 meld local_file <(ssh host cat remote_file)Compare a local and remote file (using process substitution)
Multicore
•taskset -c 0 nprocRestrict a command to certain processors
•find -type f -print0 | xargs -r0 -P$(nproc) -n10 md5sumProcess files in parallel over available processors
 sort -m <(sort data1) <(sort data2) >data.sortedSort separate data files over 2 processors
… reply

100 hectareas in ensenada.

10 months, 5 days ago by WillNorris?

View Larger Map
listing:

pictures:

… reply

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Changed by WillNorris on 22 Sep 2008 - 16:02 - r3

About

Will is a hacker and software development professional with a profound interest in wiki and social collaboration, process management, realtime simulation, and data visualization.

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