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Count the number of queries to a MySQL server
This is sample output - yours may be different.
6

echo "SHOW PROCESSLIST\G" | mysql -u root -p | grep "Info:" | awk -F":" '{count[$NF]++}END{for(i in count){printf("%d: %s\n", count[i], i)}}' | sort -n

bpfx · 2009-02-05 14:24:20 40
Count the number of characters in each line
This is sample output - yours may be different.
5

awk '{count[length]++}END{for(i in count){printf("%d: %d\n", count[i], i)}}'

bpfx · 2009-02-05 14:20:39 26
Total procs, avg size (RSS) and Total mem use
This is sample output - yours may be different.
0

ps awwwux | grep httpd | grep -v grep | awk '{mem = $6; tot = $6 + tot; total++} END{printf("Total procs: %d\nAvg Size: %d KB\nTotal Mem Used: %f GB\n", total, mem / total, tot / 1024 / 1024)}'

bpfx · 2009-02-05 14:19:51 24
To find the count of each open file on a system (that supports losf)
This is sample output - yours may be different.
2

sudo lsof | awk '{printf("%s %s %s\n", $1, $3, $NF)}' | grep -v "(" | sort -k 4 | gawk '$NF==prv{ct++;next} {printf("%d %s\n",ct,$0);ct=1;prv=$NF}' | uniq | sort -nr

bpfx · 2009-02-05 14:18:57 76
view all lines without comments.
This is sample output - yours may be different.
1

grep -v "^#" file.txt | more

briealeida · 2009-02-05 14:07:28 58
search for files or directories, then show a sorted list of just the unique directories where the matches occur

Ever use 'locate' to find a common phrase in a filename or directory name? Often you'll get a huge list of matches, many of which are redundant, and typically the results are not sorted. This command will 'locate' your search phrase, then show you a sorted list of just the relevant directories, with no duplications. So, for example, maybe you have installed several versions of the java jre and you want to track down every directory where files matching "java" might exist. Well, a 'locate java' is likely to return a huge list with many repeated directories since many files in one directory could contain the phrase "java". This command will whittle down the results to a minimal list of unique directory names where your search phrase finds a match.
This is sample output - yours may be different.
2

for i in $(locate your_search_phrase); do dirname $i; done | sort | uniq

realbrewer · 2009-02-05 14:03:20 24
List all packages with no dependencies (yum based system)

This command lists all packages in a yum based system that no other packages depend on. Hence, these packages are good candidates for removal. It's a great command for cleaning up a yum based distribution after installation. Show Sample Output
This is sample output - yours may be different.
```
Setting up yum
Loaded plugins: fastestmirror, refresh-packagekit
Loading mirror speeds from cached hostfile
xorg-x11-drv-siliconmotion-1.6.0-1.fc9.x86_64
xorg-x11-drv-fpit-1.2.0-1.fc9.x86_64
nss_db-2.2-43.fc10.x86_64
...
```
0

package-cleanup --leaves --all

drebes · 2009-02-05 13:51:27 36
Start a new command in a new screen window

If you are already running screen then you often want to start a command in a fresh window. You use this alias by typing 's whatever' from your command line and 'whatever' starts running in a new window. Good with interactive commands like info, vim, and nethack.
This is sample output - yours may be different.
19

alias s='screen -X screen'; s top; s vi; s man ls;

jonty · 2009-02-05 13:47:14 38
kill all foo process

Kill all processes with foo in them. Similar to pkill but more complete and also works when there is no pkill command. Works on almost every Linux/Unix platform I have tried.
This is sample output - yours may be different.
1

ps -ef | grep [f]oo | awk '{print $2}' | xargs kill -9

eredicatorx · 2009-02-05 13:43:01 61
Easily search running processes (alias).

Show Sample Output
This is sample output - yours may be different.
```
ps? ruby

13687 s000  S+     0:06.91 ruby script/server
13693 s001  R+     0:00.00 grep ruby
```
57

alias 'ps?'='ps ax | grep '

fzero · 2009-02-05 13:36:37 48
Creates a SSHFS volume on MacOS X (better used as an alias). Needs FuseFS and SSHFS (obvioulsly).

To make it even more practical, make sure you can login to the ssh server using a keypair.
This is sample output - yours may be different.
1

mkdir /Volumes/sshdisk 2> /dev/null; sshfs user@server:/ /Volumes/sshdisk -oreconnect,volname=SSHDisk

fzero · 2009-02-05 13:31:15 26
Find the process ID of such program:

pgrep is an useful tool which looks through the currently running processes and lists the process IDs which matches the selection criteria to stdout. pkill can also be used with pgrep to send a kill signal to the program. Show Sample Output
This is sample output - yours may be different.
```
1234
```
0

pgrep xterm

leonardovaz · 2009-02-05 13:29:30 30
Get me yesterday's date, even if today is 1-Mar-2008 and yesterday was 29-Feb-2008

Fool date by setting the timezone out by 24 hours and you get yesterday's date. Try TZ=XYZ-24 to get tomorrow's date. I live in TZ=GMT0BST so you might need to shift the number 24 by the hours in your timezone.
This is sample output - yours may be different.
1

TZ=XYZ24 date

jonty · 2009-02-05 13:27:14 25
Link all the files in this directory to that directory

I find this handy for linking all the bin files in a package to /usr/bin or all the man files to /usr/share/man. You can replace * with */* to operate on all the files in subdirectories.
This is sample output - yours may be different.
0

cd /this/directory; for f in *; do ln -s `pwd`/$f /that/directory; done

jonty · 2009-02-05 13:21:16 47
list your device drivers

great for running off a bootable cd to identify hardware other os's can't detect
This is sample output - yours may be different.
5

lspci -vv

kumara · 2009-02-05 13:01:41 24
cpuinfo
This is sample output - yours may be different.
1

cat /proc/cpuinfo

kumara · 2009-02-05 12:46:50 38
look for a function reference in a library set
This is sample output - yours may be different.
1

nm --defined-only --print-file-name lib*so 2>/dev/null | grep ' pthread_create$'

kumara · 2009-02-05 12:43:05 67
look for a header reference in a shared library
This is sample output - yours may be different.
0

strings libc-2.2.5.so | grep stat.h

kumara · 2009-02-05 12:41:41 36
diff directories, quick cut and paste to view the changes

We use this to quickly highlight differences and provide a quick way to cut and paste the command to view the files using the marvellous vimdiff Show Sample Output
This is sample output - yours may be different.
```
vimdiff dir1/filea dir2/filea
vimdiff dir1/fileb dir2/fileb
vimdiff dir1/filec dir2/filec
```
1

diff -q dir1/ dir2/ | grep differ | awk '{ print "vimdiff " $2 " " $4 }'

binaryslate · 2009-02-05 12:37:00 34
bulk dl files based on a pattern

-O switch creates local filename same as remote curl [][] -o #1#2 makes local files unique inserting sequence values into #x placeholders sequences can be alpha or numeric e.g [a-z] [1-25]
This is sample output - yours may be different.
5

curl -O http://hosted.met-art.com/generated_gallery/full/061606AnnaUkrainePasha/met-art-free-sample-00[00-19].jpg

kumara · 2009-02-05 12:35:07 28
list all file-types (case-insensitive extensions) including subdirectories
This is sample output - yours may be different.
0

find /path/to/dir -type f |sed 's/^.*\///'|grep -o '\.[^.]*$'|sort -f|uniq -i

beila · 2009-02-05 12:34:44 61
while series of video and subtitles have unmatched file names, rename subtitles the same as video files.

Subtitles' file names contain S04E01, S04E02, ... S04E12 and end with ".smi". Videos' file names contain S04E01, S04E02, ... S04E12 and end with ".avi". You can change the patterns by changing `ls *S04E$jj*.smi` and `ls *S04E$jj*.avi` parts. You can change the number of starting and ending file by changing `seq -f "%02.0f" 1 12` part.
This is sample output - yours may be different.
0

for jj in `seq -f "%02.0f" 1 12`; do rr=`ls *S04E$jj*.smi`; tt=`ls *S04E$jj*.avi`; mv "$rr" "${tt%.*}.smi"; done

beila · 2009-02-05 12:16:06 25
Replaces every ocurrences of 'old' for 'new' in all files specified

Replaces every ocurrence of 'old' for 'new' in all files specified. After the 'i' char you can put a '~' or whatever to create a backup file for each replaced with the name equal to the original plus character.
This is sample output - yours may be different.
0

perl -i -pe "s/old/new/g" *

pandres · 2009-02-05 12:07:27 66
cycle through a 256 colour palette

just for fun
This is sample output - yours may be different.
14

yes "$(seq 232 255;seq 254 -1 233)" | while read i; do printf "\x1b[48;5;${i}m\n"; sleep .01; done

pixelbeat · 2009-02-05 12:01:37 25
Serve current directory tree at http://$HOSTNAME:8000/
This is sample output - yours may be different.
846

python -m SimpleHTTPServer

pixelbeat · 2009-02-05 11:57:43 146
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Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

Calculate days on which Friday the 13th occurs

I removed the dependency of the English language

Search commandlinefu from the command line

There's probably a more efficient way to do this rather than the relatively long perl program, but perl is my hammer, so text processing looks like a nail. This is of course a lot to type all at once. You can make it better by putting this somewhere: $ clf () { (curl -d "q=$@" http://www.commandlinefu.com/search/autocomplete 2>/dev/null) | egrep 'autocomplete|votes|destination' | perl -pi -e 's/$/\n\n/g;s/^ +|\([0-9]+ votes,//g;s/^\//http:\/\/commandlinefu.com\//g'; } Then, to look up any command, you can do this: $ clf diff This is similar to http://www.colivre.coop.br/Aurium/CLFUSearch except that it's just one line, so more in the spirit of CLF, in my opinion.

Increment the filename of png in a given directory by one

output the contents of a file removing any empty lines including lines which contain only spaces or tabs.

List all installed Debian packages

Should work on all systems that use dpkg and APT package management.

Resume scp of a big file

HTTP GET request on wireshark remotly

Watch the progress of 'dd'

The previously-posted one-liner didn't work for me for whatever reason, so I ended up doing this instead.

seq can produce the same thing as Perl's ... operator.

Optionally, one can use {1..50} instead of seq. E.g. for i in {1..50} ; do echo Iteration $i ; done

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