Commands using cat sorted by votes

Commands using cat (514)

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show how many regex you use in your vim today

i want to count how many regex code i have used in vim in a long time so i make a directory in svn host and post record to this directory of course i dont want to post manually so i worte a script to do that and this is the core thing to do Show Sample Output
This is sample output - yours may be different.
```
:1,$s/^[0-9]\+//g
```
1

cat ~/.viminfo | sed -n '/^:[0-9]\+,$[0-9]\+\|\$$s/p'

jyf · 2009-11-29 01:54:57 7
generate random password

generate password Show Sample Output
This is sample output - yours may be different.
```
15fIrGab5C
```
1

cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 10 | sed 1q

gnuyoga · 2009-12-01 09:09:56 6
Find unused IPs on a given subnet
This is sample output - yours may be different.
1

nmap -sP <subnet>.* | egrep -o '[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+' > results.txt ; for IP in {1..254} ; do echo "<subnet>.${IP}" ; done >> results.txt ; cat results.txt | sort -n -t . -k 1,1 -k 2,2 -k 3,3 -k 4,4 | uniq -u

bortoelnino · 2010-01-22 00:26:42 4
Testing ftp server status

I must monitorize a couple of ftp servers every morning WITHOUT a port-scanner Instead of ftp'ing on 100 ftp servers manually to test their status I use this loop. It might be adaptable to other services, however it may require a 'logout' string instead of 'quit'. The file ftps.txt contains the full list of ftp servers to monitorize.
This is sample output - yours may be different.
1

for host in $(cat ftps.txt) ; do if echo -en "o $host 21\nquit\n" |telnet 2>/dev/null |grep -v 'Connected to' >/dev/null; then echo -en "FTP $host KO\n"; fi done

vlan7 · 2010-01-26 15:34:18 3
Using numsum to sum a column of numbers.

if you, like me, do not have the numsum, this way can do the same. Show Sample Output
This is sample output - yours may be different.
```
1653
```
1

echo $(( $( cat count.txt | tr "\n" "+" | xargs -I{} echo {} 0 ) ))

glaudiston · 2010-01-27 10:02:30 4
Automagically update grub.conf labels after installing a new kernel

I like to label my grub boot options with the correct kernel version/build. After building and installing a new kernel with "make install" I had to edit my grub.conf by hand. To avoid this, I've decided to write this little command line to: 1. read the version/build part of the filename to which the kernel symlinks point 2. replace the first label lines of grub.conf grub.conf label lines must be in this format: Latest [{name}-{version/build}] Old [{name}-{version/build}] only the {version/build} part is substituted. For instance: title Latest [GNU/Linux-2.6.31-gentoo-r10.201003] would turn to title Latest [GNU/Linux-2.6.32-gentoo-r7.201004]"
This is sample output - yours may be different.
1

LATEST=`readlink /boot/vmlinuz`; OLD=`readlink /boot/vmlinuz.old`; cat /boot/grub/grub.conf | sed -i -e 's/$Latest \[[^-]*$.*\]/\1-'"${LATEST#*-}"]'/1' -e 's/$Old \[[^-]*$.*\]/\1-'"${OLD#*-}"]'/1' /boot/grub/grub.conf

algol · 2010-04-21 19:16:51 6
Download and install the newest dropbox beta
This is sample output - yours may be different.
1

wget http://forums.dropbox.com && wget $(cat index.html|grep "Latest Forum Build"|cut -d"\"" -f2) && wget $(cat topic.php*|grep "Linux x86:"|cut -d"\"" -f2|sort -r|head -n1) && rm -rf ~/.dropbox* && rm index.html *.php* && tar zxvf dropbox-*.tar.gz -C ~/

kjell81d · 2010-08-28 09:23:42 3
Check if the Debian package was used since its installation/upgrade.

This script compares the modification date of /var/lib/dpkg/info/${package}.list and all the files mentioned there. It could be wrong on noatime partitions. Here is non-oneliner: #!/bin/sh package=$1; list=/var/lib/dpkg/info/${package}.list; inst=$(stat "$list" -c %X); cat $list | ( while read file; do if [ -f "$file" ]; then acc=$(stat "$file" -c %X); if [ $inst -lt $acc ]; then echo used $file exit 0 fi; fi; done exit 1 ) Show Sample Output
This is sample output - yours may be different.
```
vadim@gaendalf:~$ wasused mc
used /usr/bin/mcedit
vadim@gaendalf:~$ wasused netbeans-platform
vadim@gaendalf:~$ echo $?
1
vadim@gaendalf:~$
```
1

package=$1; list=/var/lib/dpkg/info/${package}.list; inst=$(stat "$list" -c %X); cat $list | (while read file; do if [ -f "$file" ];then acc=$(stat "$file" -c %X); if [ $inst -lt $acc ]; then echo used $file; exit 0; fi; fi; done; exit 1)

pipeliner · 2010-09-20 18:10:19 5
Rotate a pdf by 90 degrees CW
This is sample output - yours may be different.
1

pdftk input.pdf cat 1-endE output output.pdf

juanan · 2010-09-21 20:10:23 3
diff 2 remote files
This is sample output - yours may be different.
1

diff <(ssh user@host1 cat /path/to/file) <(ssh user@host2 cat /path/to/file2)

auxten · 2010-10-13 11:15:38 3
Find out my Linux distribution name and version
This is sample output - yours may be different.
1

cat /etc/*-release

frank514 · 2010-10-20 15:03:39 5
print character classes

Today I needed a way to print various character classes to use as input for a program I was writing. Also a nice way to visualize character classes. Show Sample Output
This is sample output - yours may be different.
```
pcharc '[:punct:]'
!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~
pcharc '\d[:upper:]'
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
pcharc '\w'
0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz
```
1

pcharc(){ perl -e 'for (0..255) {$_ = chr($_); print if /['$1']/}' | cat -v; echo;}

putnamhill · 2010-11-13 00:32:41 4
shell equivalent of a boss button

Nobody wants the boss to notice when you're slacking off. This will fill your shell with random data, parts of it highlighted. Note that 'highlight' is the Perl module App::highlight, not "a universal sourcecode to formatted text converter." You'll also need Term::ANSIColor. Show Sample Output
This is sample output - yours may be different.
```
mike@charron:~$ boss
00000000  54 50 35 84 2f cf 99 ea  3b e1 60 eb 08 f1 54 35  |TP5./...;.`...T5|
00000010  78 86 70 26 9e 24 f8 92  10 da 08 3c 63 10 49 32  |x.p&.$.....<c.I2|
00000020  40 e7 6d 2b e1 ef 6e ad  bf eb 4c 55 aa 41 f8 2e  |@.m+..n...LU.A..|
00000030  d3 2c ef 83 a7 85 de 3b  88 cd ff 7d f7 42 31 ed  |.,.....;...}.B1.|
00000040  77 be 21 4f a0 5a bd e7  a1 4e d6 73 2d 74 b0 be  |w.!O.Z...N.s-t..|
00000050  75 c6 6f 6e 38 ac 54 69  6f 00 51 95 ae 7d 13 d3  |u.on8.Tio.Q..}..|
00000060  d9 a4 2c 81 8a 07 38 55  b3 45 e3 62 97 2e 86 ca  |..,...8U.E.b....|
```
1

cat /dev/urandom | hexdump -C | highlight ca fe 3d 42 e1 b3 ae f8 | perl -MTime::HiRes -pne "Time::HiRes::usleep(rand()*1000000)"

doherty · 2010-12-29 21:26:18 6
Count the frequency of every word for a given file

Counts the frequency of words in a file Show Sample Output
This is sample output - yours may be different.
```
8082 the
4967 and
4061 of
3517 to
2952 a
```
1

cat YOUR_FILE|tr -d '[:punct:]'|tr '[:upper:]' '[:lower:]'|tr -s ' ' '\n'|sort|uniq -c|sort -rn

akap475a · 2011-01-14 12:34:06 3
most changed files in domains by rdiff-backup output
This is sample output - yours may be different.
1

cat /backup/hd7/rdiff-log.txt |grep Processing | awk '{ print $4 }' | sed -e 's/\// /g' | awk '{ print $1 }' |uniq -c |sort -n

kraja · 2011-03-12 18:49:09 3
Watch RX/TX rate of an interface in kb/s

A shorter version Show Sample Output
This is sample output - yours may be different.
```
in:    462.78           out:     11.38
```
1

while cat /proc/net/dev; do sleep 1; done | awk '/eth0/ {o1=n1; o2=n2; n1=$2; n2=$10; printf "in: %9.2f\t\tout: %9.2f\r", (n1-o1)/1024, (n2-o2)/1024}'

quadcore · 2011-03-26 02:52:14 3
umount --rbind mount with submounts

Original: https://bugzilla.redhat.com/show_bug.cgi?id=194342
This is sample output - yours may be different.
1

cat /proc/mounts | awk '{print $2}' | grep "^$MOUNTPOINT" | sort -r | xargs umount

boni · 2011-05-17 05:54:42 4
Print out your hard drive to a jet-direct compatible printer.

Where 192.168.1.2 is a printer with jet-direct. No, I don't suggest this as a backup method.
This is sample output - yours may be different.
1

cat /dev/hda|netcat -q 0 192.168.1.2 9100

robosquid · 2011-05-22 05:03:28 6
First file editor for newbies

This command should be the first file-editing command for a newbie. It clears file.txt (cat), and asks for input until EOF is entered on its own line (not written to file.txt).
This is sample output - yours may be different.
1

cat > file.txt << EOF

ThePCKid · 2011-06-18 17:00:38 3
Find Out My Linux Distribution Name and Version

Another way of do it in debian like distros, don't know if works for others Show Sample Output
This is sample output - yours may be different.
```
Ubuntu 10.10 \n \l
```
1

cat /etc/issue

h3nr1x · 2011-06-22 15:04:45 5
change microdvd subtitles framerate

this command example converts to 25 fps subtitles that were originally created for 24 fps movie
This is sample output - yours may be different.
1

cat subtitles.txt | perl -pe 's/} /}/g; s/{(\d+)}/=1=/; $f1=(24/25*$1); s/{(\d+)}/=2=/; $f2=(24/25*$1); $f1=~s/\..*//; $f2=~s/\..*//; s/=1=/{$f1}/; s/=2=/{$f2}/; ' > subtitles_newfps.txt

ciekawy · 2011-07-30 15:34:43 18
Given process ID print its environment variables

Same as previous but without fugly sed =x
This is sample output - yours may be different.
1

cat /proc/PID/environ | tr '\0' '\n'

egreSS · 2011-09-15 11:23:35 3

Hide comments

Hide comments and empty lines, included XML comments, Show Sample Output

nocomments () { cat $1 | egrep -v '^[[:space:]]*#|^[[:space:]]*$|^[[:space:]]*;' | sed '//d' | sed '//d'; }

RuizTapiador · 2011-11-04 12:47:39 57

print a file on a single line

Example: you have a package.txt you want to install on a system. Instead of this: cat package.txt package1 package2 package3 You want it to cat out on one line so you can print "yum install package1 package2 package3"
This is sample output - yours may be different.
1

echo $(cat file)

dtlp747 · 2011-12-22 23:05:52 3
Look at your data as a greymap image.

Keep width to a power of 2 to see patterns emerge. 512 is good. So is 4096 for huge maps. PNM headers are super basic. http://netpbm.sourceforge.net/doc/pbm.html Show Sample Output
This is sample output - yours may be different.
```
Don't share this output with the Internet. It's your raw naked data.
```
1

x=1024; y=32768; cat <(echo -e "P5\n$x $y\n255\n") <(dd if=/dev/sda1 bs=$x count=$y) > sda1.pgm

adeverteuil · 2012-03-06 03:09:16 4
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Salvage a borked terminal

This works in some situations where 'reset' and the other alternatives don't.

Get a list of the erroring cifs entries in fstab

It disturbs me when my logwatch report tells me a share or machine has disappeared, esp as mount isn't telling me what's gone. This command outputs to stderr the erroring cifs entries from fstab.

Get all IPs via ifconfig

and, a lot uglier, with sed: $ ifconfig | sed -n '/inet addr:/s/[^:]\+:$\S\+$.*/\1/p' Edit: Wanted to be shorter than the perl version. Still think that the perl version is the best..

Create the signature base string required for a Twitter stream feed

This is the SECOND command in a set for five that are needed for a Twitter stream feed. This command creates variable "b", the so-called "base string" required for oauth in Twitter stream feed requests. (The 256 char limit prevents giving it a better name) We use five environment variables created by a previous step: id, k1, once, ts and k3. The five environment variables are created in a separate command, please see my other commands. For more information on the signature base string, see dev.twitter.com/apps, click on any app (or create a new one) and then go to the "OAuth Tool" tab.

Command line calculator

This function defines a command line calculator that handles everything pythons math module can handle, e.g. trigonometric functions, sqrt, log, erf, ... (see http://docs.python.org/library/math.html). It even knows about the constants pi and e.

Get your external IP address

curl ifconfig.me/ip -> IP Adress curl ifconfig.me/host -> Remote Host curl ifconfig.me/ua ->User Agent curl ifconfig.me/port -> Port thonks to http://ifconfig.me/

Find the package that installed a command

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Sort a character string

Sorts a character string, using common shell commands.

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

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Commands using cat (514)

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