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2011-03-12 - Confoo 2011 presentation
Slides are available from the commandlinefu presentation at Confoo 2011: http://presentations.codeinthehole.com/confoo2011/
2011-01-04 - Moderation now required for new commands
To try and put and end to the spamming, new commands require moderation before they will appear on the site.
2010-12-27 - Apologies for not banning the trolls sooner
Have been away from the interwebs over Christmas. Will be more vigilant henceforth.
2010-09-24 - OAuth and pagination problems fixed
Apologies for the delay in getting Twitter's OAuth supported. Annoying pagination gremlin also fixed.




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Terminal - All commands - 11,856 results
echo {-1..-5}days | xargs -n1 date +"%Y-%m-%d" -d
bkname="test"; tobk="*" ; totalsize=$(du -csb $tobk | tail -1 | cut -f1) ; tar cvf - $tobk | tee >(sha512sum > $bkname.sha512) >(tar -tv > $bkname.lst) | mbuffer -m 4G -P 100% | pv -s $totalsize -w 100 | dd of=/dev/nst0 bs=256k
2014-07-22 15:47:50
User: johnr
Functions: cut dd du tail tar tee

This will write to TAPE (LTO3-4 in my case) a backup of files/folders. Could be changed to write to DVD/Blueray.

Go to the directory where you want to write the output files : cd /bklogs

Enter a name in bkname="Backup1", enter folders/files in tobk="/home /var/www".

It will create a tar and write it to the tape drive on /dev/nst0.

In the process, it will

1) generate a sha512 sum of the tar to $bkname.sha512; so you can validate that your data is intact

2) generate a filelist of the content of the tar with filesize to $bkname.lst

3) buffer the tar file to prevent shoe-shining the tape (I use 4GB for lto3(80mb/sec), 8gb for lto4 (120mb/sec), 3Tb usb3 disks support those speed, else I use 3x2tb raidz.

4) show buffer in/out speed and used space in the buffer

5) show progress bar with time approximation using pv


To eject the tape :

; sleep 75; mt-st -f /dev/nst0 rewoffl


1) When using old tapes, if the buffer is full and the drive slows down, it means the tape is old and would need to be replaced instead of wiping it and recycling it for an other backup. Logging where and when it slows down could provide good information on the wear of the tape. I don't know how to get that information from the mbuffer output and to trigger a "This tape slowed down X times at Y1gb, Y2gb, Y3gb down to Zmb/s for a total of 30sec. It would be wise to replace this tape next time you want to write to it."

2) Fix filesize approximation

3) Save all the output to $bkname.log with progress update being new lines. (any one have an idea?)

4) Support spanning on multiple tape.

5) Replace tar format with something else (dar?); looking at xar right now (https://code.google.com/p/xar/), xml metadata could contain per file checksum, compression algorithm (bzip2, xv, gzip), gnupg encryption, thumbnail, videopreview, image EXIF... But that's an other project.


1) You can specify the width of the progressbar of pv. If its longer than the terminal, line refresh will be written to new lines. That way you can see if there was speed slowdown during writing.

2) Remove the v in tar argument cvf to prevent listing all files added to the archive.

3) You can get tarsum (http://www.guyrutenberg.com/2009/04/29/tarsum-02-a-read-only-version-of-tarsum/)

and add >(tarsum --checksum sha256 > $bkname_list.sha256) after the tee to generate checksums of individual files !

wget https://raw.githubusercontent.com/git/git/master/contrib/completion/git-completion.bash; mv git-completion.bash ~/.git-completion.bash; echo "source ~/.git-completion.bash" > ~/.bashrc; source ~/.git-completion.bash
2014-07-22 14:21:00
User: servel333
Functions: echo mv wget

Downloads this raw script https://github.com/git/git/blob/master/contrib/completion/git-completion.bash from Github, copies it to your home directory, autoloads it in ~/.bashrc and sources it.

netstat -tlpn | sort -t: -k2 -n
2014-07-22 14:08:01
User: hute37
Functions: netstat sort
Tags: netstat

Show TCP Listen ports sorted by number

(bugs: IPV6 addresses not supported)

tar -cj / -X /tmp/exclude.txt | cstream -v 1 -c 3 -T 10 | ssh user@host 'tar -xj -C /backupDestination'
2014-07-21 18:52:19
User: fantleas
Functions: ssh tar

The files are automatically uncompressed when they reach the destination machine. This is a fast way to backup your server to your local computer while it's running (shutting down services is recommended).

A file named "exclude.txt" is needed at /tmp/ containing the following :


















mount -t cifs -o username=SlackerMojo,domain=BIGGREEDY,rw // /mnt/storage
mknod replypipe p; nc -k -lp 1234 < replypipe| nc -U /var/run/mysocket.sock > replypipe
2014-07-19 18:17:35
User: adimania
Functions: mknod

* Make a FIFO file named replypipe

* listen on 1234

* pass the request to unix socket

* unix socket will reply to replypipe

* replypipe will write reply to the client

subl $(pwd)
du -sch .[!.]* * |sort -h
2014-07-17 21:45:46
User: krizzo
Functions: du sort

This command sorts the content including hidden files in human readable format of the current directory.

cat h.txt| while read line; do curl -s -X POST 'https://www.virustotal.com/vtapi/v2/file/report' --form apikey="APIKEY" --form resource="$line"|awk -F'positives\":' '{print "VTHits"$2}'|awk -F' ' '{print $1" "$2$5$6}'|sed 's/["}]//g' && sleep 15; done
man -Pcat urxvt | \ # see description for full command
2014-07-16 23:14:14
User: malathion
Functions: man

man -Pcat urxvt | sed -n '/th: b/,/^B/p'|sed '$d'|sed '/^ \{7\}[a-z]/s/^ */^/g' | sed -e :a -e 'N;s/\n/@@/g;ta;P;D' | sed 's,\^\([^@]\+\)@*[\t ]*\([^\^]\+\),! \2\n! URxvt*\1\n\n,g' | sed 's,@@\( \+\),\n\1,g' | sed 's,@*$,,g' | sed '/^[^!]/d' | tr -d "'\`"

Prints a precompiled list of options to add to your Xresources.

Provided by Charles Torvalds here: http://www.askapache.com/linux/rxvt-xresources.html#Output_RXVT_Resources

sed -i "s/:\([a-zA-Z_]*\) =>/\1:/g" **/*.rb
2014-07-16 02:12:09
Functions: sed

Before: :key => 'value'

After: key: 'value'

I have only tested this a little, so please don't run this on anything important unless you have version control or other backups!

feh --scale-down --auto-zoom
git log --graph --decorate --pretty=oneline --abbrev-commit
git commit --allow-empty-message --message ""
2014-07-16 02:06:39

This is especially useful for adding changes to a temporary repo, such as a Gist. Avoid using this when collaborating with others.

find . -name "*.DS_Store" -type f -delete
gem install -g
ping -c 3 google.com
fn() { find . -iname "*$1*" -print; }
2014-07-15 05:30:59
User: suprjami
Functions: find

A simple bash function to the find command. I use this much more than find itself.

ethtool -S eth0 | egrep "(drop|disc|err|fifo|buf|fail|miss|OOB|fcs|full|frags|hdr|tso).*: [^0]"
2014-07-15 05:27:34
User: suprjami
Functions: egrep

A grep against ethtool to look for common errors and packet loss statistics which network drivers report in their private data, which is queried with ethool -S. This is the current grep used in xsos (https://github.com/ryran/xsos), which I originally contributed and has been improved by the community over time.

watch -n1 iptables -vnL
watch -n1 iptables -vnL
cut -f 2 -d ':' oclHashcat.pot | egrep -oi '[a-z]{1,20}' | sort | uniq > base.pot