Commands using echo sorted by votes

Commands using echo (1,545)

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Check SSL crt and key compatibility
This is sample output - yours may be different.
0

KEY_HASH=`openssl rsa -in $KEY_PATH -modulus -noout | openssl md5` && CRT_HASH=`openssl x509 -in $CERT_PATH -modulus -noout | openssl md5`; if [ "$KEY_HASH" != "$CRT_HASH" ];then echo "MD5 sums between .key and .crt files DO NOT MATCH";fi

kernel01 · 2013-08-13 11:09:23 7
all java -Xmx values in a system, add them up

This will find all the -Xmx[BIGINT] running on a system, add them up for you and give you the total. Show Sample Output
This is sample output - yours may be different.
```
39424
```
0

output=$(ps -ef|grep -i java 2>/dev/null); for w in ${output[@]}; do if [[ $w =~ .*Xmx.* ]]; then result=$(grep -oP "[0-9]+" <<< $w); echo $result ;fi ; done| awk 'BEGIN {sum=0} {for(i=1; i<=NF; i++) sum+=$i } END {print sum}'

massiverobot · 2013-08-13 14:04:17 7
Detect broken video files with mplayer and bash in the current directory

If you want avoid to be annoyed when playing your favourite video files with your video player, first run this command to stash wrong files (and test tricks to play these wrong files). Show Sample Output
This is sample output - yours may be different.
```
# annoying and the video file won't play :
$ mplayer file.mkv
...
[h264 @ 0x6ad23b85af8e6]no frame!
Error while decoding frame!
...
# so test my command before
```
0

for i in *.flv *.mkv *.avi; do mplayer -ao null -vo null -ss 0 -endpos 1 >/dev/null "$i" 2> >(grep -qi error && echo >&2 "$i seems bad"); done

sputnick · 2013-08-20 22:23:11 11
Generate an XKCD #936 style 4 word password
This is sample output - yours may be different.
0

word=$(shuf -n4 /usr/share/dict/words); for w in ${word[@]}; do w=${w^}; w=${w//\'/}; p+=$w; done; echo $p

fishdaemon · 2013-08-22 08:21:41 8
find an unused unprivileged TCP port

Should work with sh, bash, etc. Show Sample Output
This is sample output - yours may be different.
```
32768
```
0

port=32768; while netstat -atn | grep -q :$port; do port=$(expr $port + 1); done; echo $port

presto8 · 2013-08-29 17:55:55 8
Find a machine's IP address and FQDN
This is sample output - yours may be different.
0

for i in `ip addr show dev eth1 | grep inet | awk '{print $2}' | cut -d/ -f1`; do echo -n $i; echo -en '\t'; host $i | awk '{print $5}'; done

BoxingOctopus · 2013-09-05 17:50:33 7
IBM AIX: Calculate the SHA256 hashes of a directory without sha256sum

This command is for producing GNU sha256sum-compatible hashes on UNIX systems that don't have sha256sum but do have OpenSSL, such as stock IBM AIX. 1.- Saves a wrapper script for UNIX find that does the following: A.- Feeds a file to openssl on SHA256 hash calculation mode B.- Echoes the output followed by the filename 2.- Makes the file executable 3.- Runs find on a directory, only processing files, and running on each one the wrapper script that calculates SHA256 hashes Pending is figuring out how to verify a sha256sum file on a similar environment. Show Sample Output
This is sample output - yours may be different.
```
6e94b0b7fc2805ad558f8039ed038a6272f61846eaa5f4931abd826193c78b83 cognos-installers/TM1-952-AIX/952_FP2_aix.tar.gz
c9d0f04ad6f86482bf4c41ba7a303e0d8a0e8c96c9c9492bc518d2a2bc0166c7 cognos-installers/TM1-952-AIX/952_FP2_HF6_aix.tar.gz
46ede3255abff4e356b002a9cd12df259275a15910768997bfbbae3c637b7f32 cognos-installers/TM1-952-windows/TM1_9.5.2_Windows_x64.7z
92faf20dd3ff25d2c8d94308f03fd8477d0980d6b740baa96a8e79b30b49456f cognos-installers/TM1-952-windows/TM1_Workflow_9.5.2_Windows_x64.7z
630a66a1f7cc3044f370cec730820d73d66cb284a2a09e197c00f82d6900d932 cognos-installers/cognos-BI-102/cognos-FM/fm_10.2_win_ml.tar.xz
```
0

echo '#! /usr/bin/ksh\necho `cat $1 | openssl dgst -sha256` $1' > sslsha256; chmod +x sslsha256; find directory -type f -exec ./sslsha256 \{\} \;

RAKK · 2013-09-18 17:37:50 8
IBM AIX: Verify a sha256sum listing with openssl

This command is used to verify a sha256sum-formatted file hash list on IBM AIX or any other UNIX-like OS that has openssl but doesn't have sha256sum by default. Steps: 1: Save to the filesystem a script that: A: Receives as arguments the two parts of one line of a sha256sum listing B: Feeds a file into openssl on SHA256 standard input hash calculation mode, and saves the result C: Compares the calculated hash against the one received as argument D: Outputs the result in a sha256sum-like format 2: Make the script runnable 3: Feed the sha256sum listing to xargs, running the aforementioned script and passing 2 arguments at a time Show Sample Output
This is sample output - yours may be different.
```
cognos-EARs/ServletGateway-1021-SDK-customized.ear: OK
cognos-EARs/ServletGateway-1021-SDK-customizedandfixed.ear: OK
cognos-EARs/ServletGateway-1021-base.ear: OK
cognos-EARs/p2pd-1021-SDK-customized.ear: OK
cognos-EARs/p2pd-1021-base.ear: OK
```
0

echo '#! /usr/bin/ksh\ncat $2 | openssl dgst -sha256 | read hashish; if [[ $hashish = $1 ]]; then echo $2: OK; else echo $2: FAILED; fi;' > shacheck; chmod +x shacheck; cat hashishes.sha256 | xargs -n 2 ./shacheck;

RAKK · 2013-09-18 21:51:20 8
Display terminal command history with date

If the HISTTIMEFORMAT is set, the time stamp information associated with each history entry is written to the history file, marked with the history comment character. Show Sample Output
This is sample output - yours may be different.
```
    2  19/09/13 11:21:02 ./adb kill-server
    3  19/09/13 11:21:02 ./adb start-server
    4  19/09/13 11:21:02 ./adb 
    5  19/09/13 11:21:02 ./adb shell
    6  19/09/13 11:21:02 ./adb shell
    7  19/09/13 11:21:02 cd /Users/weng/Software/android-sdk-macosx/platform-tools/
    8  19/09/13 11:21:02 ./adb kill-server
    9  19/09/13 11:21:02 ./adb start-server
   10  19/09/13 11:21:02 ping 192.168.1.10
```
0

echo 'export HISTTIMEFORMAT="%d/%m/%y %T "' >> ~/.bash_profile

99RedBalloons · 2013-09-19 03:25:14 13
countdown from 10 ...
This is sample output - yours may be different.
0

clear; tput cup 8 8; for i in $(seq 1 10); do echo -n "$((11-$i)) ";sleep 1; done; tput cup 10 8; echo -e "DONE\n\n"

rgregor · 2013-10-01 11:21:25 6
Print out the contents of a Git repository (useful for broken repositories)
This is sample output - yours may be different.
0

find .git/objects -type f -printf "%P\n" | sed s,/,, | while read object; do echo "=== $obj $(git cat-file -t $object) ==="; git cat-file -p $object; done

hamador · 2013-10-02 09:09:00 10
strips ogg audio from webm video ( no reencoding )

Strips the audio track from a webm video. Use this in combination with clive or youtube-dl.
This is sample output - yours may be different.
0

for file in "$@"; do name=$(basename "$file" .webm) echo ffmpeg -i $file -vn -c:a copy $name.ogg ffmpeg -i "$file" -vn -c:a copy "$name.ogg" done

hoodie · 2013-10-05 14:49:07 9
Generate a Random (unicast) MAC address

I did not come up with this one myself, but found this somewhere else several months ago. Show Sample Output
This is sample output - yours may be different.
```
E0:C9:B3:FE:E9:65
```
0

openssl rand -hex 1 | tr '[:lower:]' '[:upper:]' | xargs echo "obase=2;ibase=16;" | bc | cut -c1-6 | sed 's/$/00/' | xargs echo "obase=16;ibase=2;" | bc | sed "s/$/:$(openssl rand -hex 5 | sed 's/$..$/\1:/g; s/.$//' | tr '[:lower:]' '[:upper:]')/"

4fd · 2013-10-22 08:40:46 7
creating you're logging function for your script

Put this logging function in you're script, when need it call it. command || logme "Error with command"
This is sample output - yours may be different.
0

logme(){ echo "$(date +%d-%m-%Y-%H:%M) => $0 @ $1 returned error" >> persoscript.log }

qcjn · 2013-10-22 15:55:01 6
Command line email/SMS Bomber

To send a text message to a phone, you need to send the text message via email. To find out how to send text messages to cell phones via email, go here - http://en.wikipedia.org/wiki/List_of_carriers_providing_Email_or_Web_to_SMS and find the carrier of the cell phone you want to send the text message to.
This is sample output - yours may be different.
0

while true; do echo "message here" | mutt something@something.com ; done

KcidKcus · 2013-10-27 23:32:54 79
Delete keys from Redis by matching a pattern

Delete items from Redis, using redis-cli, by matching a key pattern. Show Sample Output
This is sample output - yours may be different.
```
(integer) 1
(integer) 1
(integer) 1
(integer) 1
(integer) 1
```
0

for key in `echo 'KEYS pattern*' | redis-cli | awk '{print $1}'`; do echo DEL $key; done | redis-cli

caiosba · 2013-10-29 04:50:35 10
Use awk's FIELDWIDTHS function to manipulate a string.
This is sample output - yours may be different.
0

echo "rootgot" | awk 'BEGIN{FIELDWIDTHS="4 3"}{print $2$1}'

in2nix4life · 2013-11-06 14:17:37 6
Generate a random password.

Uses urandom and tr to generate a random password. Change the value of head -c## for the lenght of the password. Show Sample Output
This is sample output - yours may be different.
```
dWl2GEd7RE
```
0

echo $(< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c10)

santizo · 2013-11-07 21:51:38 7
Check if TCP port 25 is open

Check trough unix sockets if tcp port is open or close Show Sample Output
This is sample output - yours may be different.
```
TCP port 25 close
```
0

(echo >/dev/tcp/localhost/25) &>/dev/null && echo "TCP port 25 open" || echo "TCP port 25 close"

YouM · 2013-11-12 02:11:01 8
One line web server (working with any web browser)

nc is such a powerful command, it could be used instead of any OS! :p Show Sample Output
This is sample output - yours may be different.
```
/home/me> curl -i localhost:5432
HTTP/1.1 200 OK
Tue Nov 12 15:40:27 EET 2013


<p>How are you today?</p>
```
0

nc -kl 5432 -c 'echo -e "HTTP/1.1 200 OK\r\n$(date)\r\n\r\n";echo "<p>How are you today?</p>"'

gvitalie · 2013-11-12 13:43:38 6
Mass rename files in git

Taken from http://stackoverflow.com/questions/9984722/git-rename-many-files-and-folders
This is sample output - yours may be different.
0

for file in $(git ls-files | grep old_name_pattern); do git mv $file $(echo $file | sed -e 's/old_name_pattern/new_name_pattern/'); done

lpalgarvio · 2013-11-19 18:33:23 7
To display the message

This will display --> Hello World
This is sample output - yours may be different.
0

echo "Hello WOrld"

Abhay_k · 2013-11-24 10:26:50 6
Run a command in every (direct) sub-folder

Change the "run_command" to whatever command you want, and remove the "echo" to run it once you are happy.
This is sample output - yours may be different.
0

for i in */; do echo run_command "${i}"; done

mirams · 2013-11-25 18:33:26 9
one liner to rename files with for and sed

If you want to test output, run it like this: for fn in *.epub; do echo mv \"$fn\" \"`echo "$fn" | sed -E 's/\.*\/*(.*)( - )(.*)(\.[^\.]+)$/\3\2\1\4/' | sed -E 's/(.*) ([^ ]+)( - )(.*)/\2, \1\3\4/' `\";done > rename.txt Show Sample Output
This is sample output - yours may be different.
```
Input filename: The Big Wave - Pearl S. Buck.epub
Output: Buck, Pearl S. - The Big Wave.epub
```
0

for fn in *.epub; do echo mv \"$fn\" \"`echo "$fn" | sed -E 's/\.*\/*(.*)( - )(.*)(\.[^\.]+)$/\3\2\1\4/' | sed -E 's/(.*) ([^ ]+)( - )(.*)/\2, \1\3\4/' `\";done | sh

woohoo · 2013-11-30 05:29:52 6
Count music files in each directory

This lists the number of ogg/mp3/wav/flac files in each subdirectory of the current directory. The output can be sorted by piping it into "sort -n". Show Sample Output
This is sample output - yours may be different.
```
9955 .
82 ./16 Horsepower
17 ./17 Hippies
11 ./Abney Park
44 ./AC DC
10 ./Accept
1 ./Acceptance
9 ./Adiemus
6 ./Bran? Ketern?
10 ./Budapest Gypsy Symphony Orchestra
20 ./Budapester Klezmer Band
35 ./Buena Vista Social Club
12 ./Burlap To Cashmere
```
0

find . -type d -maxdepth 1 -print0 | xargs -0 -I{} sh -c 'find "{}" -type f | grep "ogg\|mp3\|wav\|flac$" | wc -l | tr -d "\n"; echo " {}"'

dbrgn · 2013-12-22 13:40:29 11
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Know which version dpkg/apt considers more recent

Compares two versions with dpkg. It is not always obvious what version dpkg/apt will consider to be more recent. Operators include the following : * These treat an empty version as earlier than any version: lt le eq ne ge gt. * These treat an empty version as later than any version: lt-nl le-nl ge-nl gt-nl. * These are provided only for compatibility with control file syntax: < > >. This command doesn't output anything. It only returns with status 0 or 1, hence the echo "y" || echo "n" to get an output.

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

calculate the total size of files in specified directory (in Megabytes)

the command will calculate the size of hidden files

Update your OpenDNS network ip

Intended for dynamic ip OpenDNS users, this command will update your OpenDNS network IP. For getting your IP, you can use one of the many one-liners here on commandlinefu. Example: I use this in a script which is run by kppp after it has successfully connected to my ISP: --- #!/bin/bash IP="`curl -s http://checkip.dyndns.org/ | grep -o '[[:digit:].]\+'`" PW="hex-obfuscated-pw-here" if [ "$IP" == "" ] ; then echo 'Not online.' ; exit 1 else wget -q --user=topsecret --password="`echo $PW | xxd -ps -r`" 'https://updates.opendns.com/nic/update?hostname=myhostname&myip='"$IP" -O - /etc/init.d/ntp-client restart & fi --- PS: DynDNS should use a similar method, if you know the URL, please post a comment. (Something with members.dyndns.org, if I recall correctly)

Create the authorization header required for a Twitter stream feed

This is the FOURTH in a set of five commands. Please see my other commands for the previous three steps. This command builds the authorization header required by Twitter. For this command to work, see my previous 3 commands (step1, step2 and step3) as they are required to build the environment variables used in this command. For more information on the authorization header, go to dev.twitter.com/apps, click on any of your apps (or create a new one) and then click on the "OAuth Tool" tab.

Migrate existing Ext3 filesystems to Ext4

Before doing this, back-up all data on any ext3 partitions that are to be converted to ext4. After running previous command you MUST run fsck, is needed to return the filesystem to a consistent state. $ fsck -pDf /dev/yourpartition Edit /etc/fstab and change the 'type' from ext3 to ext4 for any partitions that are converted to ext4.

Write comments to your history.

A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

list block devices

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

List the binaries installed by a Debian package

This shell function displays a list of binaries contained in an installed package; works on Debian based Linux distributions.

extracts 64 bytes of random digits from random lines out of /dev/random sent to stdio

Use this the next time you need to come up with a reasonably random bitstring, like for a WPA/WPA2 PSK or something. Takes a continuous stream of bytes coming from /dev/urandom, runs it through od(1), picking a random field ($0 and $1 excluded) from a random line and then prints it.

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Commands using echo (1,545)

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