Commands using echo sorted by votes

Commands using echo (1,545)

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Disable ASLR

Disable randomisation address Show Sample Output

-1

echo 0 > /proc/sys/kernel/randomize_va_space

gunslinger_ · 2010-07-11 16:42:42 3

tail all logs opened by all java processes

Tail all logs that are opened by all java processes. This is helpful when you are on a new environment and you do not know where the logs are located. Instead of java you can put any process name. This command does work only for Linux. The list of all log files opened by java process: sudo ls -l $(eval echo "/proc/{$(echo $(pgrep java)|sed 's/ /,/')}/fd/")|grep log|sed 's/[^/]* //g'
This is sample output - yours may be different.
-1

sudo ls -l $(eval echo "/proc/{$(echo $(pgrep java)|sed 's/ /,/')}/fd/")|grep log|sed 's/[^/]* //g'|xargs -r tail -f

vutcovici · 2010-07-30 18:20:00 3
Greets the user appropriately
This is sample output - yours may be different.
-1

echo -e "12 morning\n15 afternoon\n24 evening" | awk '{if ('`date +%H`' < $1) print "Good " $2}'

bazardeur · 2010-09-24 21:15:23 4
Get all the HTTP HEAD responses from a list of urls in a file

urls.txt should have a fully qualified url on each line prefix with rm log.txt; to clear the log change curl command to curl --head $file | head -1 >> log.txt to just get the http status Show Sample Output
This is sample output - yours may be different.
```
==log.txt:==
/downloads HTTP/1.1 301 Moved Permanently
/downloads/ HTTP/1.1 404 Not Found
/downloads/downloads/press/logos.zip HTTP/1.1 200 OK
```
-1

for file in `cat urls.txt`; do echo -n "$file " >> log.txt; curl --head $file >> log.txt ; done

Glutnix · 2010-10-19 02:54:13 5
Get weather

Uses the Wunderground web API to get weather data. Change the STA variable to a station near you. Show Sample Output
This is sample output - yours may be different.
```
West@8.0mph 56.2F
```
-1

STA=KILCHICA30 PAG=http://api.wunderground.com/weatherstation/WXCurrentObXML.asp?ID=${STA} D=($(curl -s $PAG | sed -n 's/.*<$temp_f\|wind_dir\|wind_mph$>$.*$<\/.*/\2/p')) echo ${D[1]}@${D[2]}mph ${D[0]}F

sud0er · 2010-10-28 00:40:28 10
Create a new chrome profile and run it

Change the value of p to match the path where you wish to create the profile. To run it again in the future, use the parameter --user-data-dir (which gets echoed to you when run): chromium-browser --user-data-dir=/path/to/your/ Quick Functions: # create a new chromium profile new-chromium-profile() { p=~/.config/chromium/$1; cp -r ~/.config/chromium/Default $p && echo "chromium-browser --user-data-dir=$p" && chromium-browser --user-data-dir=$p; } # runs a chromium profile run-chromium-profile() { chromium-browser --user-data-dir=~/.config/chromium/$1; } Show Sample Output
This is sample output - yours may be different.
```
chromium-browser --user-data-dir=/home/z/.config/chromium/zed

[A new chrome profile gets created and runs itself.]
```
-1

p=~/.config/chromium/zed; cp -r ~/.config/chromium/Default $p && echo "chromium-browser --user-data-dir=$p" && chromium-browser --user-data-dir=$p;

zed · 2010-11-08 02:45:29 4
get memory configuration (not consumption) for all running VMware virtual machines

So your boss wants to know how much memory has been assigned to each virtual machine running on your server... here's how to nab that information from the command line while logged in to that server Show Sample Output
This is sample output - yours may be different.
```
              aa.devel.mydomain.com.vmx: 1024 M
                 devel.mydomain.com.vmx: 2048 M
                   ftp.mydomain.com.vmx: 256 M
                  mail.mydomain.com.vmx: 256 M
                         testdotnet.vmx: 3072 M
                          testjava2.vmx: 3072 M
                          testjava3.vmx: 3072 M
                           testjava.vmx: 3072 M
                   web.mydomain.com.vmx: 256 M
                              rhel5.vmx: 2048 M
```
-1

for file in $( vmrun list | grep 'vmx$' | sort ); do printf "% 40s %s M\n" $(echo "$( echo -n ${file}:\ ; grep memsize $file )" | sed -e 's/.*\///' -e 's/"//g' -e 's/memsize.=//'); done;

linuxrawkstar · 2010-11-19 06:14:11 3
Function that swaps the filenames of two given files.

(Changed to "bartonskis" suggestion.)
This is sample output - yours may be different.
-1

flipf(){ if [ -f "$1" -a -f "$2" ]; then mv "$1" "$1.$$" && mv "$2" "$1" && mv "$1.$$" "$2" || echo "$!"; else echo "Missing a file: $!"; fi; }

Void42 · 2010-12-16 10:38:28 7
Pick the first program found from a list of alternatives

This function is used to set environmental variables from a list of alternatives depending on what's installed on the system. It returns the first program found in the list. Example usage: export BROWSER=$(find_alternatives chromium-browser google-chrome opera firefox firefox-bin iceweasel konqueror w3m lynx) . export EDITOR=$(find_alternatives vim nano pico emacs kate) . export PAGER=$(find_alternatives vimpager less most more pg)
This is sample output - yours may be different.
-1

find_alternatives(){ for i;do which "$i" >/dev/null && { echo "$i"; return 0;};done;return 1;}

eightmillion · 2011-01-06 19:53:46 3
Terrorist threat level text

Numbers are less understandable then words. Also this may put out a different result.
This is sample output - yours may be different.
-1

echo "Terrorist threat level: `sed $(perl -e "print int rand(99999)")"q;d" /usr/share/dict/words`"

houghi · 2011-01-28 09:49:37 4
Root Security

This will tighten up security for your box. The default value for PermitRootLogin sadly is 'yes'.
This is sample output - yours may be different.
-1

s=/etc/ssh/sshd_config;r=PermitRootLogin;cp $s{,.old}&& if grep $r $s;then sed "s/$r yes/$r no/" $s.old > $s; else echo $r no >> $s;fi

kzh · 2011-01-30 23:41:59 11
Use socat to create a largefile
This is sample output - yours may be different.
-1

echo | socat -u - file:/tmp/swapfile,create,largefile,seek=10000000000000

madrasi · 2011-02-08 00:30:38 4
Tricky implementation of two-dimensional array in Bash
This is sample output - yours may be different.
-1

getarray(){ a=$1;b="${a[$2]}";eval "c=$b";echo "${c[$3]}";return 0;};a[0]="( a b c )";a[1]="( d e f )";getarray a 1 2

glaudiston · 2011-02-20 00:58:41 3
Add a list of numbers
This is sample output - yours may be different.
-1

echo $((1+2+3+4))

dimesacks · 2011-02-24 21:57:44 3
Generate MD5 of string and output only the hash checksum
This is sample output - yours may be different.
-1

echo -n "String to get MD5" | md5sum | sed "s/ -//"

Tephlon · 2011-03-03 23:40:04 3
Generate MD5 of string and output only the hash checksum
This is sample output - yours may be different.
-1

echo -n "String to MD5" | md5sum | awk '{print $1}'

twjolson · 2011-03-05 02:37:28 4
one line command to recursively add all jar files in current folder to java class path

a pretty simple script when running java programs from command line Show Sample Output
This is sample output - yours may be different.
```
.:/home/hyhu/Ubuntu One/javalibs/a.jar:/home/hyhu/Ubuntu One/javalibs/b.jar:/home/hyhu/Ubuntu One/javalibs/c.jar:/home/hyhu/Ubuntu 
```
-1

CLASSPATH=.; export CLASSPATH=$CLASSPATH$(find "$PWD" -name '*.jar' -type f -printf ':%p\n' | sort -u | tr -d '\n'); echo $CLASSPATH

dexterhu · 2011-03-11 19:21:15 3
recursively add all sub folders with executable file of current folder to PATH environment variable

(1) don't run twice, or the same folder will occur in $PATH. (2) otherwise you need to start a new terminal Show Sample Output
This is sample output - yours may be different.
```
blah blah blah ..... (too long)
```
-1

export PATH=$PATH$(find "$PWD" -name '.*' -prune -o -type f -a -perm /u+x -printf ':%h\n' | sort -u | tr -d '\n'); echo $PATH

dexterhu · 2011-03-11 19:31:17 7
Selecting a random file/folder of a folder

Here's a bash version using an array.
This is sample output - yours may be different.
-1

a=(*); echo ${a[$((RANDOM % ${#a[@]}))]}

putnamhill · 2011-03-18 13:24:52 3
Convert filenames from ISO-8859-1 to UTF-8

Warn: use convmv or detox if you can: they are the right tools. But if you want to do it manually, you can use this command to find the problematic files and transliterate their accented characters to their ascii equivalent. (Useful when doing cd backup: growisofs may fail on files which come from the old iso8859-* days.)
This is sample output - yours may be different.
-1

LANG=fr_FR.iso8859-1 find . -name '*['$'\xe9'$'\xea'$'\xeb'$'\xc9'']*'|while read f; do a="$(echo $f|iconv -f iso8859-1 -t ascii//TRANSLIT)"; echo "move $f => $a"; done

gibboris · 2011-04-06 17:03:31 3
Check a internet connetion is up. If it isn't write a log.

This command are using by me for checking connection with Internet. Show Sample Output
This is sample output - yours may be different.
```
8.8.8.8 ping failed at 12/05/11 12:48:28
8.8.8.8 ping failed at 12/05/11 12:48:41
```
-1

while true; do /bin/ping -q -c1 -w3 8.8.8.8 2>&1 > /dev/null || echo "8.8.8.8 ping failed at $(date +%d/%m/%y) $(date +%H:%M:%S)" >> /var/log/ping.log; sleep 10; done &

Arkey · 2011-05-12 01:51:07 4
Show seconds since modified of newest modified file in directory
This is sample output - yours may be different.
-1

echo $(( $( date +%s ) - $( stat -c %Y * | sort -nr | head -n 1 ) ))

depesz · 2011-05-12 14:29:45 3
urldecoding

urldecode files in current directrory
This is sample output - yours may be different.
-1

ls * | while read fin;do fout=$(echo -n $fin | sed -e's/%$[0-9A-F][0-9A-F]$/\\\\\x\1/g' | xargs echo -e);if [ "$fout" != "$fin" ];then echo "mv '$fin' '$fout'";fi;done | bash -x

pawelb1973 · 2011-05-18 07:24:54 82
Send an email using the mutt email client

It's very similar to this thread: http://www.commandlinefu.com/commands/view/4317/send-a-local-file-via-email mutt your@email_address.com -s "Message Subject Here" -a attachment.jpg </dev/null
This is sample output - yours may be different.
-1

M=bob@example.com; echo "Email message" | mutt -s "Email Subject" $M

igorfu · 2011-05-23 08:31:14 11
monitor when target host will be up
This is sample output - yours may be different.
-1

while true; do date; ssh <YOUR HOST HERE> "echo" && echo "HOST UP" && break; sleep 60; done

unixmonkey11685 · 2011-05-29 19:54:16 3
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View the newest xkcd comic.

This function displays the latest comic from xkcd.com. One of the best things about xkcd is the title text when you hover over the comic, so this function also displays that after you close the comic. To get a random xkcd comic, I also use the following: $xkcdrandom(){ wget -qO- dynamic.xkcd.com/comic/random|tee >(feh $(grep -Po '(?

Print all lines in a file that are not a certain length

Alternatively, print all the lines that are a certain length: $awk 'length($0)==12 {print}' your_file_name

Show a Package Version on RPM based distributions

if you want to see all information about a package use: rpm -qi pkgname full list of querytags can be accessed by the command: rpm --querytags you can also customize the query format how ever you like with using more querytags together along with escape sequences in "man printf"! you can also use more than one package name. for example this command shows name and version in to columns: rpm -q --queryformat %-30{NAME}%{VERSION}\\n pkg1 pkg2

Generate a (compressed) pdf from images

use imagemagik convert

find text in a file

this will find text in the directory you specify and give you line where it appears.

list block devices

Shows all block devices in a tree with descruptions of what they are.

Find out if a module is installed in perl

Shows the path if the module is installed or exit quietly (to simply avoid the 'No documentation found' msg).

Show database sql schema from Remote or Local database

After ssh into server, run this command to show all the table structure and schema.

check open ports without netstat or lsof

List just the executable files (or directories) in current directory

A bit shorter ;)

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Commands using echo (1,545)

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