Commands using echo sorted by votes

Commands using echo (1,545)

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Shows how many percents of all avaliable packages are installed in your gentoo system

Use bc for decimals...
This is sample output - yours may be different.
0

echo $(echo 'scale=2; ' '100 * ' $(eix --only-names -I | wc -l) / $(eix --only-names | wc -l) | bc -l)%

MeaCulpa · 2010-10-25 15:42:15 3
kill all process that belongs to you

Kills all process that belongs to the user that runs it - excluding bash, sshd (so putty/ssh session will be spared). The bit that says grep -vE "..." can be extended to include ps line patterns that you want to spare. If no process can be found on the hitlist, it will print # NOTHING TO KILL. Otherwise, it will print # KILL EM ALL, with the cull list.
This is sample output - yours may be different.
0

ps -u $USER -lf | grep -vE "\-bash|sshd|ps|grep|PPID" > .tmpkill; if (( $(cat .tmpkill | wc -l) > 0 )); then echo "# KILL EM ALL"; cat .tmpkill; cat .tmpkill | awk '{print $4}' | xargs kill -9; else echo "# NOTHING TO KILL"; fi; cat .tmpkill; rm .tmpkill;

zsugiart · 2010-11-04 04:16:50 5
Days left before password expires

This works only with GNU date. In solaris the command: date +%s doesn't work. You can try using the following instead: nawk 'BEGIN {print srand()}' should give the same output as date +%s under Solaris. Show Sample Output
This is sample output - yours may be different.
```
15

or

99516

The lastter one means that the password never expire.
```
0

let NOW=`date +%s`/86400 ; PASS_LAST_CHANGE=`grep $USER /etc/shadow | cut -d: -f3` ; PASS_LIFE=`grep $USER /etc/shadow | cut -d: -f5`; DAYS_LEFT=$(( PASS_LAST_CHANGE + PASS_LIFE - NOW)) ; echo $DAYS_LEFT

EBAH · 2010-11-05 23:03:48 7
Persistent saving of iptables rules

a simple command in order to make iptables rules permanent, run @ sudo!
This is sample output - yours may be different.
0

iptables-save > firewall.conf; rm -f /etc/network/if-up.d/iptables; echo '#!/bin/sh' > /etc/network/if-up.d/iptables; echo "iptables-restore < firewall.conf" >> /etc/network/if-up.d/iptables; chmod +x /etc/network/if-up.d/iptables

dddddsadasdasd · 2010-11-13 23:58:28 4
Watch and keep history of a command

Watch any command (pipes ok, quotes be careful) and keep history in a file. Good for watching and recording any kind of status or error condition, file creations, etc. The choice of "who" as CMD was just to show an obvious usage. Uses plenty of shell tricks that can be disassembled for simpler stuff. It's deliberately not perfect, but it is generic, and can be customized for your own uses. Had to shorten a little to meet 255 chars. Better than "watch" how? It keeps a date log of what is going on, and tee'd output is plain-text. Show Sample Output
This is sample output - yours may be different.
```
Mon Dec 25 14:15:30 EST 2099
Diff #0 (1s): who
1c1
<
---
> [me]     pts/1        2099-12-25 09:50 ([i.forget])
Mon Dec 25 14:15:32 EST 2099
Diff #4 (1s): who
1a2
> [notme]  pts/2        2099-12-25 14:15 ([i.forget])
Mon Dec 25 14:20:37 EST 2099
Diff #11 (1s): who
1a2
< [notme]  pts/2        2099-12-25 14:15 ([i.forget])
```
0

CMD="who";SEC=1;N=0;OLD="";NEW=""; while `sleep $SEC`; do OLD="$NEW"; NEW="$(eval $CMD)"; DIFF=`diff <( echo "$OLD" ) <( echo "$NEW" )`; if [ -n "$DIFF" ]; then date; echo "Diff #$N (${SEC}s): $CMD"; echo "$DIFF"; fi; N=$[$N+1]; done | tee /tmp/keepr

DoNotRememberMe · 2010-11-15 19:55:39 3
create random string from /dev/urandom (or another length)

The same command, but with a base64 filter, more forgiving for special characters than tr. Show Sample Output
This is sample output - yours may be different.
```
lMlZ1ivrDed9y45IGwMbAL2HIAMcd7xqfcd1kjNvThSnn8ZCeQOZAqHc2RilUN2f
```
0

echo `cat /dev/urandom | base64 | tr -dc "[:alnum:]" | head -c64`

Dereckson · 2010-12-06 21:04:57 3
telling you from where your commit come from

usage: where COMMIT for instance: where 1178c5950d321a8c5cd8294cd67535157e296554 where HEAD~5 Show Sample Output
This is sample output - yours may be different.
```
1178c5950d321a8c5cd8294cd67535157e296554 is ahead of 
(project16/taskbranch-514)
by 3 commits
   
```
0

function where(){ COUNT=0; while [ `where_arg $1~$COUNT | wc -w` == 0 ]; do let COUNT=COUNT+1; done; echo "$1 is ahead of "; where_arg $1~$COUNT; echo "by $COUNT commits";};function where_arg(){ git log $@ --decorate -1 | head -n1 | cut -d ' ' -f3- ;}

noisy · 2010-12-08 15:41:39 3
Recursively scan directories for mp3s and pass them to mplayer
This is sample output - yours may be different.
0

$ find . -iname *.mp3 | while read line ; do ln -s "$line" $(echo -e "$line" | openssl md5).mp3 ; done ; mpg123 *.mp3

yababay · 2011-01-02 20:54:37 3
a simple bash one-liner to create php file and call php function
This is sample output - yours may be different.
0

echo '<?php echo str_rot13 ("Hello World\n") ?>' | php

argulp · 2011-01-04 22:26:46 3
List and count the number of open sessions per user
This is sample output - yours may be different.
0

users | xargs -n1 echo | sort | uniq -c

michaelmior · 2011-01-05 19:05:05 3
Mixing music in bash

Of course, a fifo is required for piloting the fade out of another song, but with a few bash function, we can mix music in bash like : crossfadeIn > mplayerfifo1 & crossfadeOut > mplayerfifo2 loop 0 10 > mplayer fifo1 etc etc
This is sample output - yours may be different.
0

( for((i=0;$i<100;i++))do echo volume $i 1; sleep 0.1s; done; )| mplayer -slave -quiet sample.mp3

Juluan · 2011-01-06 11:22:03 6
get a random command
This is sample output - yours may be different.
0

find $(echo "$PATH" | tr ':' ' ') -name "*program*"

hunterm · 2011-01-07 22:27:44 5
Get the IP of the host your coming from when logged in remotely

host -i `echo $SSH_CLIENT | cut -f 1 -d \ ` | sed 's/.* domain name pointer $.*$\./\1/' to reverse lookup and get the hostname.
This is sample output - yours may be different.
0

echo $SSH_CLIENT | cut -f 1 -d ' '

infinull · 2011-01-11 10:20:45 4
number files in directory according to their modification time

i use this after ripping internet radio streams to number the files as they originally played (even though streamripper can do this with -q). to number other types of files, or all files, just change the *mp3. to rename directories only you could use ... ls -lt | grep ^d | cut -d ":" -f2 | cut -d " " -f2- | while read ... Show Sample Output
This is sample output - yours may be different.
```
$> touch a.mp3 b.mp3 c.mp3 d.mp3
$> ls
a.mp3  b.mp3  c.mp3  d.mp3

$> IFS=$'\n'; i=1; ls -lt *mp3 | cut -d ":" -f2 | cut -d " " -f2- | while read f; do mv "$f" $(echo "$i"."$f"); ((i++)); done

$> ls
1.a.mp3  2.b.mp3  3.c.mp3  4.d.mp3
```
0

IFS=$'\n'; i=1; ls -lt *mp3 | cut -d ":" -f2 | cut -d " " -f2- | while read f; do mv "$f" $(echo "$i"."$f"); ((i++)); done

m1cawber · 2011-01-22 00:21:12 6
sort a list of comma separated numbers: sort_csn

"sort_csn" is a function to sort a comma separated list of numbers. Define the the function with this: sort_csn () { echo "${1}" | sed -e "s/,/\n/g"| sort -nu | awk '{printf("%s,",$0)} END {printf("\n")}' | sed -e "s/,$//"; } Use the function like this: sort_csn 443,22,80,8200,1533,21,1723,1352,25 21,22,25,80,443,1352,1533,1723,8200 One example where this is useful is when port scanning with nmap and getting a list of open ports in random order. If you use Nessus, you may need to create a scan policy for that set of specific ports and it is clearer to read with the port numbers in ascending order (left to right). Caveat: no spaces in the comma separated list (just number1,number2,number3,etc). A variation of this to sort a comma separated list of strings: sort_css () { echo "${1}" | sed -e "s/,/\n/g"| sort -u | awk '{printf("%s,",$0)} END {printf("\n")}' | sed -e "s/,$//"; } usage: sort_css apples,pears,grapes,melons,oranges apples,grapes,melons,oranges,pears Show Sample Output
This is sample output - yours may be different.
```
$ sort_csn () { echo "${1}" | sed -e "s/,/\n/g"| sort -nu | awk '{printf("%s,",$0)} END {printf("\n")}' | sed -e "s/,$//"; }
$ sort_csn 443,22,80,8200,1533,21,1723,1352,25
21,22,25,80,443,1352,1533,1723,8200
```
0

sort_csn () { echo "${1}" | sed -e "s/,/\n/g"| sort -nu | awk '{printf("%s,",$0)} END {printf("\n")}' | sed -e "s/,$//"; }

mpb · 2011-01-26 15:18:08 5
Terrorist threat level text

Used curl instead of wget (minor change) Used the full-url instead of the shortened one (in case is.gd goes down/empties their cache) turned the tail | awk bit into a single awk command. Show Sample Output
This is sample output - yours may be different.
```
Terrorist threat level: ELEVATED
```
0

echo "Terrorist threat level: $(curl -s 'http://www.dhs.gov/dhspublic/getAdvisoryCondition' | awk -F\" 'NR==2{ print $2 }')"

infinull · 2011-01-28 00:23:13 5
Rename files in a directory in an edited list fashion

just an alternative to #7818 Show Sample Output
This is sample output - yours may be different.
```
Rename file: 1one
To: 1one.txt
`1one' -> `1one.txt'
Rename file: 2two
To: one plus one
`2two' -> `one plus one'
Rename file: 3three
To: 3three
Rename file: 4four
To: 2 x 2
`4four' -> `2 x 2'
Rename file: 5five
To: 5five.avi
`5five' -> `5five.avi'
```
0

exec 3<&0; ls -1N | while read a; do echo "Rename file: $a"; read -e -i "$a" -p "To: " b <&3 ; [ "$a" == "$b" ] || mv -vi "$a" "$b"; done

forcefsck · 2011-02-08 21:21:39 166
Generate Pascal's Triangle

http://en.wikipedia.org/wiki/Pascal%27s_triangle This one's for bartonski. Enjoy. 132 characters. I'm sure we can do better. Note: after row 64 we overflow integer maths. Show Sample Output
This is sample output - yours may be different.
```
1 
1 1 
1 2 1 
1 3 3 1 
1 4 6 4 1 
1 5 10 10 5 1 
1 6 15 20 15 6 1 
1 7 21 35 35 21 7 1 
1 8 28 56 70 56 28 8 1 
```
0

for((r=1;r<10;r++));do v=1;echo -n "$v ";for((c=1;c<$r;c++));do v2=$(($(echo "$v*($r-$c)/$c")));echo -n "$v2 ";v=$v2;done;echo;done

flatcap · 2011-02-10 18:38:04 239
Calculate 1**2 + 2**2 + 3**2 + ...

Simplified the series to a polynomial and send it to bc
This is sample output - yours may be different.
0

N=10; echo "($N*($N+1)*(2*$N+1))/6" | bc

PhillipNordwall · 2011-02-15 20:02:57 3
Console clock

Does the same but without a pipe and a new shell.
This is sample output - yours may be different.
0

while sleep 1; do echo -n "\r`date`"; done

nkoehring · 2011-02-15 23:48:37 3
ARP Scan

The following syntax will scan a range of IP addresses. At the point of a ARP response being received it will show a reply message. www.fir3net.com Show Sample Output
This is sample output - yours may be different.
```
arping 10.1.1.20
Unicast reply from 10.1.1.20 [00:50:53:47:AD:2A]  0.938ms
arping 10.1.1.21
arping 10.1.1.22
arping 10.1.1.23
```
0

if [ -x /sbin/arping ] ; then for i in {1..255} ; do echo arping 10.1.1.$i ; arping -c 1 10.1.1.$i | grep reply ; done ; fi

felix001 · 2011-02-21 21:03:09 4
Generate MD5 of string and output only the hash checksum in a readable format

Same result with simpler regular expression.. Show Sample Output
This is sample output - yours may be different.
```
23 e4 a2 a9 d1 c1 25 73 3a 2e 6b 79 7f 7f 54 ef
```
0

echo -n "String to MD5" | md5sum | sed -e 's/../& /g' -e 's/ -//'

saibbot · 2011-03-06 12:59:07 3
a simple interactive tool to convert Simplified Chinese (typed by pinyin) to Traditional Chinese 简繁中文转换

a simple interactive tool to convert Simplified Chinese (typed by pinyin) to Traditional Chinese Show Sample Output
This is sample output - yours may be different.
```
Simplied Chinese:
&#40857;&#30340;&#20256;&#20154;
Traditional Chinese:
&#40845;&#30340;&#20659;&#20154;
&#31616;&#32321;&#20013;&#25991;&#36716;&#25442;
Traditional Chinese:
&#31777;&#32321;&#20013;&#25991;&#36681;&#25563;
```
0

echo "Simplied Chinese:"; while read -r line; do echo "Traditional Chinese:"; echo $line | iconv -f utf8 -t gb2312 | iconv -f gb2312 -t big5 | iconv -f big5 -t utf8; done

dexterhu · 2011-03-11 12:26:25 15
Download YouTube music playlist and convert it to mp3 files

umph is parsing video links from Youtube playlists ( http://code.google.com/p/umph/ ) cclive is downloading videos from Youtube ( http://cclive.sourceforge.net/ ) Example: yt-pl2mp3 7AB74822FE7D03E8
This is sample output - yours may be different.
0

yt-pl2mp3() {umph -m 50 $1 | cclive -f mp4_720p; IFS=$(echo -en "\n\b"); for track in $(ls | grep mp4 | awk '{print $0}' | sed -e 's/\.mp4//'); do (ffmpeg -i $track.mp4 -vn -ar 44100 -ac 2 -ab 320 -f mp3 $track.mp3); done; rm -f *.mp4}

sattellite · 2011-03-20 14:43:20 3
Watch RX/TX rate of an interface in kb/s
This is sample output - yours may be different.
0

while :; do OLD=$NEW; NEW=`cat /proc/net/dev | grep eth0 | tr -s ' ' | cut -d' ' -f "3 11"`; echo $NEW $OLD | awk '{printf("\rin: % 9.2g\t\tout: % 9.2g", ($1-$3)/1024, ($2-$4)/1024)}'; sleep 1; done

DerksIT · 2011-03-22 10:23:33 3
‹ First < 34 35 36 37 38 > Last ›

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Recursively remove .svn directories from a local repository

Big Countdown Clock with hours, minutes and seconds

Figlet is easy to find for download on the internet, and works for any text. Quite cool.

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Shows cpu load in percent

Show the current load of the CPU as a percentage. Read the load from /proc/loadavg and convert it using sed: Strip everything after the first whitespace: $ sed -e 's/ .*//' Delete the decimal point: $ sed -e 's/\.//' Remove leading zeroes: $ sed -e 's/^0*//'

Convert encoding from cp1252 (MS Windows) to UTF-8 on source code files

Check syntax of all Perl modules or scripts underneath the current directory

Finds all *.p[ml]-files and runs a perl -c on them, checking whether Perl thinks they are syntactically correct

Run a file system check on your next boot.

The empty file /forcefsck causes the file system check fsck to be run next time you boot up, after which it will be removed. This works too: $sudo >/forcefsck

view certificate details

Remount an already-mounted filesystem without unmounting it

Necessary for fsck for example. The remount functionality follows the standard way how the mount command works with options from fstab. It means the mount command doesn't read fstab (or mtab) only when a device and dir are fully specified. After this call all old mount options are replaced and arbitrary stuff from fstab is ignored, except the loop= option which is internally generated and maintained by the mount command. It does not change device or mount point.

One liner to parse all epubs in a directory and use the calibre ebook-convert utility to convert them to mobi format

all ebook-convert -options are optional. all you really need to pass ebook-convert is the incoming and outgoing names, with extensions. Has been tested on Ubuntu 10.10

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Commands using echo (1,545)

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