Commands using cat sorted by votes

Commands using cat (514)

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Get all URL With Extension from File
This is sample output - yours may be different.
0

cat File.txt | grep -io 'http://www.acme.com/a/files/.*.pdf'| uniq

nedzoul · 2014-10-31 14:51:57 8
Have a user generate an ssh key if it does not already exist and spit it in bold red to stdout
This is sample output - yours may be different.
0

if [ -e ~/.ssh/id_rsa.pub ] ; then echo $'\033[1;31m' ; cat ~/.ssh/id_rsa.pub ; echo $'\033[0m' ; else ssh-keygen -t rsa -b 4096 -f ~/.ssh/id_rsa -t rsa -P ""; echo $'\033[1;31m' ; cat ~/.ssh/id_rsa.pub ; echo $'\033[0m'; fi

sdoradus · 2014-12-01 03:48:19 8
Copy your ssh public key to a server from a machine that doesn't have ssh-copy-id

same as above, however without the chmod, you wont be able to SSH to the machine as the openssh server will require tigther permissions
This is sample output - yours may be different.
0

cat ~/.ssh/id_rsa.pub | ssh user@machine "mkdir ~/.ssh; cat >> ~/.ssh/authorized_keys; chmod -R ~/.ssh"

omarrar · 2014-12-04 18:55:53 9
See crontabs for all users that have one

This is not exhaustive but after checking /etc/cron* is a good way to see if there are any other jobs any users may have set. Note: this is a repost from a comment "flatcap" made on http://www.commandlinefu.com/commands/view/3726/print-crontab-entries-for-all-the-users-that-actually-have-a-crontab#comment, for which I am grateful and I take no credit.
This is sample output - yours may be different.
0

for USER in /var/spool/cron/*; do echo "--- crontab for $USER ---"; cat "$USER"; done

tyzbit · 2014-12-11 19:48:46 15
compute the total disk space consumed by a list of files

Given a list of filenames, one per line, in /tmp/filelist, calculate the total sum disk usage.
This is sample output - yours may be different.
0

LISTCOUNT=0; LISTSIZE=0; cat /tmp/filelist | while read FF; do FILESIZE=$(stat -c%s "$FF"); LISTSIZE=$[LISTSIZE+${FILESIZE}]; echo listsize: $LISTSIZE; LISTCOUNT=$[LISTCOUNT+1]; echo listcount: $LISTCOUNT; done | tail -2

mwtzzz · 2015-01-13 00:53:04 8
Generate a random alphanumeric string (works on Mac)
This is sample output - yours may be different.
0

cat /dev/urandom | strings | grep -o '[[:alnum:]]' | head -n 15 | tr -d '\n'; echo

rekky · 2015-01-31 23:07:23 8
Copy ssh keys to user@host to enable password-less ssh logins with permissions alignment.

One liner that basically duplicates ssh-copy-id functionality by taking care of most common issues of SSH password-less ssh logins: - missing key on the remote server - braindead permissions *cough* RHEL *cough* Show Sample Output
This is sample output - yours may be different.
```
Host key copied
```
0

cat ~/.ssh/id_rsa.pub | ssh user@hostname 'cat >> ~/.ssh/authorized_keys && chmod 600 ~/.ssh/authorized_keys && chmod 700 ~/.ssh && echo "Host key copied"'

rde · 2015-02-17 01:46:03 9

This helps me determine which repo I want to use for downloading ISO files Show Sample Output

cat repos.txt | while read line; do echo $line | cut -d"/" -f 3 | fping -e ;done

rawm · 2015-02-17 06:34:07 8

search "<keyword>" <file>

Add this to your bash profile, then quickly & easily (regex) search for and highlight keywords, with full text output.
This is sample output - yours may be different.
0

function search() { cat ${@:1} | grep --color=always -E "$1|$" }

miscreant · 2015-03-18 18:34:11 40
Compare a remote file with a local file

opens the output of some command as a file so this also works with graphical editors like meld, kdiff3 etc meld <(ssh $remote_site cat .zshrc) .zshrc
This is sample output - yours may be different.
0

diff <(ssh $remote_site cat $file) $file

hal8 · 2015-05-09 11:11:56 11
Display a formated comma seperated spreadsheet .csv with letters and numbers for easy viewing and to check formula entry..

In addition one can evaluate the formulas in the venerable spreadsheet command sc, with an additional command. function csvev () { cat $1 | sed -e '1i,,,,,,,' |sed -e 's/=sum/@sum/g' -e 's/=SUM/@SUM/g' | psc -k -d, | sed -e 's/\"@SUM(/@SUM(/' -e 's/)"/)/' | sed '/@SUM/ { s/rightstring/let/; }' | sed -e '/= "=/s/rightstring/let/' -e '/= "=/s/"//g' | sed 's/= =/= /g' | sc ; } I will post this command separately as well. Show Sample Output
This is sample output - yours may be different.
```
0	a     b     c              d        e        f        g        h            j       k    l  m  n  o  p
     1	Name  Date  email          Amount1  Amount2  Amount3  Amount4  Total
     2	Erik  2015  sf@none.net    10       20       30       10       =SUM(D2:G2)
     3	joe   2014  joe@none.net   5        10       15       10       =SUM(D3:G3)
     4	jill  2015  jill@none.net  10       25       30       10       =SUM(D4:G4)
     5	                                                               =SUM(H2:H4)  =G2+G3  =H2
```
0

function sheet () { cat "$1" | sed '1s/^/a,b,c,d,e,f,g,h,j,k,l,m,n,o,p\n/' | column -s , -tn | nl -v 0 ; }

eakinc · 2015-07-13 03:14:35 9
Evaluate simple formulas in a .csv spreadsheet by converting and piping to the venerable sc.

Requires psc, sed, sc, and cat. Working with csv spreadsheets with formulas in them to evaluate the formulas using sc. View the formulas in a numbered and lettered formated in command line. function sheet () { cat "$1" | sed '1s/^/a,b,c,d,e,f,g,h,j,k,l,m,n,o,p\n/' | column -s , -tn | nl -v 0 ; }
This is sample output - yours may be different.
0

cat FILE.csv |sed -e '1i,,,,,' |sed -e 's/=sum/@sum/g' -e 's/=SUM/@SUM/g' |psc -k -d, |sed -e 's/\"@SUM(/@SUM(/' -e 's/)"/)/' -e '/@SUM/ { s/rightstring/let/; }' -e '/= "=/s/rightstring/let/' -e '/= "=/s/"//g' -e 's/= =/= /g' |sc

eakinc · 2015-07-13 04:11:31 10
Prepend text to a file
This is sample output - yours may be different.
0

echo "text to prepend" | cat - file

rahouni · 2015-07-17 11:15:34 9
tsv file to json file

Need to change values of 'field 1'...'field 3' to column names. input_file.tsv is the tab file you want to conver output_file.json is the file that is created with the json output. Assumes your tsv has no headers.
This is sample output - yours may be different.
0

export FIELDS=field_1,field_2,field_3; cat input_file.tsv| ruby -rjson -ne 'puts ENV["FIELDS"].split(",").zip($_.strip.split("\t")).inject({}){|h,x| h[x[0]]=x[1];h}.to_json' > output_file.json

prees · 2015-07-24 15:00:34 9
Outputs unique error messages from the apache log and count, sorted by frequency

Outputs unique error messages from the apache log, sorted by frequency. Tested on log format: [Wed Aug 26 00:00:00 2015] [error] [client xx.xx.xx.xx] Error message here Show Sample Output
This is sample output - yours may be different.
```
63 PHP PHP Warning: json_encode(): Invalid UTF-8 sequence in argument
10 Warning: Warning: preg_match() expects parameter 2 to be string, array given
7 PHP PHP Warning: Invalid argument supplied for foreach() in ...
5 PHP PHP Warning: implode(): Invalid arguments passed in ...
1 PHP PHP Parse error: syntax error, unexpected ',' in ...
```
0

cat /var/log/apache2/error.log | awk '{out=$9;for(i=9;i<=NF;i++){out=out" "$i}; print out}' | sed s/,\ referer.*// | sort | uniq -c | sort -nr

cmattoon · 2015-08-26 14:14:12 10
printing text between tags
This is sample output - yours may be different.
0

echo or cat something | grep -Po '(?<=text_before).*(?=text_after)'

petteriIII · 2015-09-11 09:19:57 9
Monitor memory fine-grained usage (e.g. firefox)

I have modified the original one-liner to allow it to manage multiple PIDs. However, I haven't found the way it can work properly with the watch command. NOTE: brace expand must be activated via "set -B" in order to this script can work. Show Sample Output
This is sample output - yours may be different.
```
961936 KB
```
0

cat $(echo "ls /proc/{`pidof firefox | sed -e 's/$/,/' -e 's/ /,/g'`}/smaps 2>/dev/null" | bash) | awk '/Rss/{sum += $2; } END{print sum, "KB"}'

pchalim · 2015-09-30 22:22:53 9
Info cpu

4.1.6-1-ARCH Info cpu
This is sample output - yours may be different.
0

cat /proc/cpuinfo | less

olto · 2015-10-01 04:34:03 10
Operating system identification data

Files contain operating system identification data Show Sample Output
This is sample output - yours may be different.
```
NAME=
ID=
PRETTY_NAME=
ANSI_COLOR=
HOME_URL=
SUPPORT_URL=
```
0

cat /etc/os-release

olto · 2015-10-22 04:31:36 9
finds all bean ids in all xml files from the current folder

finds all xml files greps them for extracts the bean id sorts the ids creates a list of distinct entries, a unique list of bean ids Show Sample Output
This is sample output - yours may be different.
```
groupManager
groupPermissionsDelegate
groupPermissionsDelegate
handleResolver
hashRegistry
hazelcastCacheCompactor
hazelcastCacheConfigManager
```
0

find . -iname "*.xml" | xargs cat | grep '<bean[^>]\+id=' | sed 's/.*id="$[^"]\+$".*/\1/g' | sort | uniq -u

gruzilla · 2015-11-06 07:57:22 10
memory information
This is sample output - yours may be different.
0

cat /proc/meminfo

blasetherexaler · 2015-11-11 05:09:52 9
Merge files in current directory
This is sample output - yours may be different.
0

find . -type f -name '*.csv' -exec cat {} + >> merged.csv

swarzynski · 2015-11-19 10:06:21 10
View formatted table of users on the system

Useful to see login name, UID, GID, home dir, and login shells of all users. Show Sample Output
This is sample output - yours may be different.
```
root    x  0  0  root    /root      /bin/bash
daemon  x  1  1  daemon  /usr/sbin  /usr/sbin/nologin
bin     x  2  2  bin     /bin       /usr/sbin/nologin
```
0

cat /etc/passwd | column -nts :

HeinrichHartmann · 2015-12-08 11:24:58 10
Find Rhyming Words

rhyme time mime rhyme lowrez Juarez
This is sample output - yours may be different.
0

rhyme() { { cat /usr/share/dict/words; printf %s\\n "$1"; } | rev | sort | rev | grep -FxC15 -e "${1?}" | grep -Fxve "$1" | shuf -n1; }

lowrez · 2016-01-02 03:24:44 13
output your mp3 file over SSH on a remote computer's speaker

This command is useful for sending mp3-sound by the quick way using SSH.
This is sample output - yours may be different.
0

cat /home/user/file.mp3 | ssh -C user@host mpg123 -

Zeben · 2016-03-29 12:30:09 12
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Rename all images in current directory to filename based on year, month, day and time based on exif information

Open Remote Desktop (RDP) from command line having a custom screen size

This example uses xfreerdp, which builds upon the development of rdesktop. This example usage will also send you the remote machine's sound.

Monitor all DNS queries made by Firefox

check open ports without netstat or lsof

extracting audio and video from a movie

rips the audio and video stream of a movie. The two streams are stored separately.

Scan LAN and get Windows host names

Map the slot of an I/O card to its PCI bus address

Recent hardware may or may not enumerate *both of* these values

List out classes in of all htmls in directory

Lists out all classes used in all *.html files in the currect directory. usefull for checking if you have left out any style definitions, or accidentally given a different name than you intended. ( I have an ugly habit of accidentally substituting camelCase instead of using under_scores: i would name soemthing counterBox instead of counter_box) WARNING: assumes you give classnames in between double quotes, and that you apply only one class per element.

Keep track of diff progress

You're running a program that reads LOTS of files and takes a long time. But it doesn't tell you about its progress. First, run a command in the background, e.g. $ find /usr/share/doc -type f -exec cat {} + > output_file.txt Then run the watch command. "watch -d" highlights the changes as they happen In bash: $! is the process id (pid) of the last command run in the background. You can change this to $(pidof my_command) to watch something in particular.

Check which files are opened by Firefox then sort by largest size.

Check which files are opened by Firefox then sort by largest size (in MB). You can see all files opened by just replacing grep to "/". Useful if you'd like to debug and check which extensions or files are taking too much memory resources in Firefox.

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Commands using cat (514)

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