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commandlinefu.com is the place to record those command-line gems that you return to again and again.

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May 19, 2015 - A Look At The New Commandlinefu
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All commands from sorted by
Terminal - All commands - 12,361 results
ls -ldct /lost+found |awk '{print $6, $7}'
some_very_long_and_complex_command # label
2009-09-08 05:58:27
User: jamolkhon
88

When using reverse-i-search you have to type some part of the command that you want to retrieve. However, if the command is very complex it might be difficult to recall the parts that will uniquely identify this command. Using the above trick it's possible to label your commands and access them easily by pressing ^R and typing the label (should be short and descriptive).

UPDATE:

One might suggest using aliases. But in that case it would be difficult to change some parts of the command (such as options, file/directory names, etc).

file -i <textfile>
2009-09-08 01:33:19
User: juvenn
Functions: file
2

This command gives you the charset of a text file, which would be handy if you have no idea of the encoding.

curl -u username:password --silent "https://mail.google.com/mail/feed/atom" | tr -d '\n' | awk -F '<entry>' '{for (i=2; i<=NF; i++) {print $i}}' | sed -n "s/<title>\(.*\)<\/title.*name>\(.*\)<\/name>.*/\2 - \1/p"
2009-09-07 21:56:40
User: postrational
Functions: awk sed tr
44

Checks the Gmail ATOM feed for your account, parses it and outputs a list of unread messages.

For some reason sed gets stuck on OS X, so here's a Perl version for the Mac:

curl -u username:password --silent "https://mail.google.com/mail/feed/atom" | tr -d '\n' | awk -F '<entry>' '{for (i=2; i<=NF; i++) {print $i}}' | perl -pe 's/^<title>(.*)<\/title>.*<name>(.*)<\/name>.*$/$2 - $1/'

If you want to see the name of the last person, who added a message to the conversation, change the greediness of the operators like this:

curl -u username:password --silent "https://mail.google.com/mail/feed/atom" | tr -d '\n' | awk -F '<entry>' '{for (i=2; i<=NF; i++) {print $i}}' | perl -pe 's/^<title>(.*)<\/title>.*?<name>(.*?)<\/name>.*$/$2 - $1/'
cat testfile | hexdump -C
tar czf /path/archive_of_foo.`date -I`.tgz /path/foo
2009-09-07 05:45:33
Functions: tar
Tags: backup tar
1

creates a compressed tar archive of files in /path/foo and writes to a timestamped filename in /path.

tar --create --file /path/$HOSTNAME-my_name_file-$(date -I).tar.gz --atime-preserve -p -P --same-owner -z /path/
2009-09-07 04:52:12
User: Odin_sv
Functions: date tar
Tags: backup tar
1

Use tar command for a backup info with a date of creation

psg() { ps aux | grep "[${1[1]}]${1[2,-1]}"; }
2009-09-07 04:37:11
User: jedahan
Functions: grep ps
-5

alias ps?='psg' for maximum hawtness. Works in bash or zsh.

fuser -k `who -u | awk '$6 == "old" { print "/dev/"$2'}`
2009-09-07 03:36:43
User: lbonanomi
Functions: awk fuser
Tags: Linux solaris
2

Shell timeout variables (TMOUT) can be very liberal about what is classified as 'activity', like having an editor open. This command string will terminate the login shell for an user with more than a day's idle time.

pkg search SEARCH_TERM | awk '{print $NF}' | sed -e 's;.*/\(.*\)\@.*;\1;' | sort -u
system_profiler SPApplicationsDataType | perl -nl -e [email protected]=<>; [email protected]; while($j<$c){ $apps[$i].=$al[$j]; $i++ if ($al[$j] ) =~ /^\s\s\s\s\S.*:$/; $j++} while($k<$i){ $_=$apps[$k++]; if (/Kind: PowerPC/s) {print;}}'
2009-09-06 20:56:48
User: drewk
Functions: perl
Tags: Os X perl
0

This finds all the PowerPC apps recognized by OS X.

A better version is:

system_profiler SPApplicationsDataType 2> /dev/null | perl -

wnl -e '$i=$j=$k=$p=0; @al=; [email protected]; while($j

s[$i].=$al[$j]; $i++ if ($al[$j]) =~ /^\s\s\s\s\S.*:$/; $j++} while($k

apps[$k++]; if (/Kind: PowerPC/s) {print; $p++;}} print "$i applications, $p P

owerPC applications\n\n"'

but that is more than 255 characters...

find . -name '*.html' -exec 'sed' 's/.*class="\([^"]*\?\)".*/\1/ip;d' '{}' ';' |sort -su
2009-09-06 18:43:18
User: kamathln
Functions: find sort
1

Lists out all classes used in all *.html files in the currect directory. usefull for checking if you have left out any style definitions, or accidentally given a different name than you intended. ( I have an ugly habit of accidentally substituting camelCase instead of using under_scores: i would name soemthing counterBox instead of counter_box)

WARNING: assumes you give classnames in between double quotes, and that you apply only one class per element.

find . -regex '.*\(h\|cpp\)'
2009-09-06 11:33:19
User: Vereb
Functions: find
Tags: bash find
7

This is the way how you can find header and cpp files in the same time.

prev=0;next=1;echo $prev;while(true);do echo $next;sum=$(($prev+$next));prev=$next;next=$sum;sleep 1;done
while [ -n "`pgrep wget`" ]; do sleep 2 ;done; [ -e "/tmp/nosleep"] || echo mem >/sys/power/state
2009-09-06 05:51:20
User: kamathln
Functions: echo sleep
1

[Note: This command needs to be run as root].

If you are downloading something large at night, you can start wget as a normal user and issue the above command as root. When the download is done, the computer will automatically go to sleep. If at any time you feel the computer should not go to sleep automatically(like if you find the download still continuing in the morning), just create an empty file called nosleep in /tmp directory.

curl -Is slashdot.org | sed -ne '/^X-[FBL]/s/^X-//p'
awk 'BEGIN {a=1;b=1;for(i=0;i<'${NUM}';i++){print a;c=a+b;a=b;b=c}}'
2009-09-06 03:05:55
User: arcege
Functions: awk
Tags: awk
0

Does not require input to function or complete. Number of iterations controlled by shell variable $NUM.

<ctrl-shift-t>
2009-09-05 18:01:32
User: tobiasboon
Tags: firefox
-10

This is really not cli but I think it's neat.

alias ':q'='exit'
2009-09-05 17:59:50
User: tobiasboon
Functions: alias
Tags: vim alias exit :q
9

Put this in your ~/.bashrc file (or the equivalent)

If you use vim a lot, this alias will be immediately obvious. Your brain will thank you.

<ctrl-f> in ex mode in vim
2009-09-05 14:43:15
User: Vereb
Functions: ex
Tags: vim
4

If you are in ex mode in vim i.e. you've pressed ':'. You can edit the current command by pressing <ctrl-f>

lspci -v | perl -ne '/VGA/../^$/ and /VGA|Kern/ and print'
grep -oE "ssid=\".*\"" /etc/wpa_supplicant.conf | cut -c6- | sed s/\"//g | zenity --list --title="Choose Access Point" --column="SSID"
2009-09-05 10:41:05
Functions: cut grep sed
1

If you still connect to your wireless access point manually and need to use wpa_supplicant, the above fu will grep all of the known SSID from your wpa_supplicant.conf file, present it in a Zenity list and return the SSID name you choose. I've wrapped this command in to a bash script that then up's the interface, associates and autenticates. Saves me from using NetworkManager ;)

dd if=/dev/cdrom of=whatever.iso
2009-09-05 09:19:41
User: 0disse0
Functions: dd
Tags: backup dd iso dvd
8

A dear friend of mine asked me how do I copy a DVD to your hard drive? If you want to make a copy of the ISO image that was burned to a CD or DVD, insert that medium into your CD/DVD drive and (assuming /dev/cdrom is associated with your computer?s CD drive) type the following command

sudo dd if=/dev/hda1 of=/dev/hdb2
2009-09-05 09:16:52
User: 0disse0
Functions: dd sudo
5

This command clone the first partition of the primary master IDE drive to the second partition

of the primary slave IDE drive (!!! back up all data before trying anything like this !!!)

od -vt x1 /tmp/spaghettifile