Commands using cat sorted by votes

Commands using cat (514)

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Password server

This server can be access by a browser or other remote terminal with ncat. I have to use de test && break to allow ctrl-c to close. Show Sample Output
This is sample output - yours may be different.
```
#abGqHf=MM
o_DoB5da`#
```
0

while [ 1 ]; do cat /dev/urandom | tr -dc ' -~' | head -c 10 | ncat -l 8080 &> /dev/null; test $? -gt 128 && break; done

xxjcaxx · 2016-05-04 14:36:47 10
sorta apache logs by ip frequency
This is sample output - yours may be different.
0

cat access.log | awk '{print $1}' | sort -n | uniq -c | sort -nr | head -20

prees · 2016-05-05 20:52:03 13
Calculate comment density of shell scripts in a directory

Show Sample Output
This is sample output - yours may be different.
```
7882 lines = 7576 sloc [96%] + 306 comments [3%]
```
0

dir=/rom; a=$(find $dir -name \*.sh -exec cat '{}' \; | egrep -cv '^[[:space:]]*#'); b=$(find $dir -name \*.sh -exec cat '{}' \; | egrep -c '^[[:space:]]*#'); echo $((a+b)) lines = ${a} sloc [$((a*100/(a+b)))%] + ${b} comments [$((b*100/(a+b)))%]

koniu · 2016-05-19 08:35:56 86
Monitor Wireless Adapter Stats

Monitors basic wireless interface statistics, such as signal strength and discarded packets. The watch command's -n parameter sets a refresh rate of every 1 second. Show Sample Output
This is sample output - yours may be different.
```
Inter-| sta-|   Quality        |   Discarded packets               | Missed | WE
 face | tus | link level noise |  nwid  crypt   frag  retry   misc | beacon | 22
 wlan0: 0000   58.  -52.  -256        0      0      0    449    540        0
```
0

watch -n 1 cat /proc/net/wireless

1nF1D3L · 2016-09-04 02:44:51 16
Remove color codes (special characters) with sed

... building upon Zhoul's EXCELLENT example... my 'expect' output had additional garbage. This script also: * converts the ESC-H sequence (reposition cursor) to new-line characters * removes BACKSPACES and BELLS * removes trailing spaces * removes NON-ASCII characters * and consolidates redundant lines (my input had multiple blank lines (100s))
This is sample output - yours may be different.
0

cat $* | sed -e "s,\x1B\[[0-9;]*[H],+++NEWLINE+++,g" -e "s,\x1B\[[0-9;]*[a-zA-Z],,g" -e "s,+++NEWLINE+++,\x0A,g" -e "s,\x07,,g" -e "s,\x08,,g" | sed -e "s, *$,,g" -e "s,[^ -~],,g" | uniq

quirkasaurus · 2016-09-09 15:32:32 18
cat file.txt | pv -qL 15
This is sample output - yours may be different.
0

cat File.txt | pv -qL 15

yalthon · 2016-10-28 14:37:14 16
set text file into background

aha (https://github.com/theZiz/aha) is a program to convert ANSI escape sequence of a unix terminal to HTML code. wkhtmltoimage is a program to convert html file to image file. This one-liner will convert text file to image file, and set the image file as wallpaper by feh without temporary file.
This is sample output - yours may be different.
0

cat foo.txt | aha --black --line-fix | wkhtmltoimage -q --minimum-font-size 18 - - | feh --bg-max -

mk19 · 2017-02-05 07:07:41 20
check for hanging postgres process (postmaster.pid)

to kill, use `kill PID` Credit: user Craig Ringer on stackexchange.com, recommends to kill the process rather than deleting postmaster.pid when there is an orphan Postgresql server process. Show Sample Output
This is sample output - yours may be different.
```
42356
/usr/local/var/postgres
1485996870
5432
/tmp
localhost
  5432001    131072
```
0

cat /usr/local/var/postgres/postmaster.pid

ctcrnitv · 2017-02-07 02:38:28 19
[MySQL] Get which table were dumped in [mysql_dump_file]

Show Sample Output
This is sample output - yours may be different.
```
table1 table2 table3 ...
```
0

cat [mysql_dump_file] | grep "Table structure" | cut -c 30- | tr '\n' ' ' | rev | cut -c 2- | rev | tr -d '`'

Lidorah · 2017-02-08 09:26:01 16
See memory usage precentage
This is sample output - yours may be different.
0

cat /proc/meminfo | awk -v"RS=~" '{print "Total:", $2/1024000, "GiB","|","In Use:",100-$5/$2*100"%"}'

Moshem · 2017-02-20 12:20:01 17
Get purescript externs

just some jq code... Show Sample Output
This is sample output - yours may be different.
```
{
  "kind": "ValueRef",
  "value": "notEq1"
}
{
  "kind": "TypeInstanceRef",
  "value": "eqBoolean"
}
```
0

cat externs.json | jq ".efExports | .[] | (keys|.[0]) as \$kind | {kind:\$kind,value:(.[\$kind] |.Ident?)}"

wires · 2017-04-01 13:55:53 29
Display which distro is installed

Cleaner than the top alternative Show Sample Output
This is sample output - yours may be different.
```
Distributor ID:	Debian
Description:	Debian GNU/Linux 8.7 (jessie)
Release:	8.7
Codename:	jessie
```
0

test `uname` = Linux && lsb_release -a 2>/dev/null || ( test `uname` = SunOS && cat /etc/release || uname -rms )

amhhhhhhh · 2017-04-25 13:35:40 21
Do mathematical operation on every line of a given file for the first value found to be replaced (other lines stay untouched)

The given file may contain any kind of characters. This is compatible for most simple mathematical operation. For the first number found, it will be replaced by the result of a factor operation of 1000. To change the filename or multiplactor or number regular expression, change the first fixed values. Show Sample Output
This is sample output - yours may be different.
```
For a given filename such as test.csv, a new filename new_test.csv will be created containing the new values after the math operation.
command source: cat test.csv
command output: cat new_test.csv
```
0

n=1000;f="test.csv";r='([0-9]+.{0,1}[0-9]*)';echo -n "" > new_${f};cat $f | while read l;do val=`echo $l | egrep -o $r` ; if [ ! -z $val ];then newval=`echo $val \* $n | bc -l`;l=`echo $l | sed "s/$val/$newval/"`;fi;echo $l >> new_${f};unset val;done

s333 · 2017-04-26 18:04:07 19
Enumerar Registros MX

Extrae los registros MX Show Sample Output
This is sample output - yours may be different.
```
El output Depende del equipo.
```
0

for domain in $(cat dominios.txt); do nslookup -type=mx $domain ; done >ejemplo.txt

nedzoul · 2017-07-04 20:35:47 17
Copy a file over SSH without SCP
This is sample output - yours may be different.
0

cat file | ssh user@remotehost "cat > file"

luckyone777 · 2017-07-26 20:36:02 18
Visual system load display

It takes the first value of /prov/loadavg to print that many stars followed by the value. Show Sample Output
This is sample output - yours may be different.
```
******************** 20.98
********************* 21.30
******************* 19.92
**************** 16.85
*************** 15.50
************** 14.90
```
0

while [ true ]; do cat /proc/loadavg | perl -ne 'm/(^[^ ]+)/; $L = $1; print "*" x $L; print " $L\n";' ; sleep 6; done

t3o · 2017-10-13 06:47:06 22
Create unique IP and count list of hits against URL in Pound LB logs, redirect to file
This is sample output - yours may be different.
0

cat *pound* | grep someURL.com | awk '{print $7}'| uniq -c | sort -bgr >> uniqueIPwC.txt

MannWare · 2017-11-16 20:18:55 18
To rotate all PDF pages clockwise:
This is sample output - yours may be different.
0

pdftk in.pdf cat 1-endeast output out.pdf

fabio · 2017-11-17 14:38:39 19
Cat without comment
This is sample output - yours may be different.
0

cat /etc/squid/squid.conf | egrep -v "(^#.*|^$)"

tofu00 · 2017-11-29 10:16:49 41
Convert Kubernetes ConfigMaps to Secrets

simple jq one-liner to convert from configmaps to secrets (which require the values to be base64 encoded). To automatically pull the config map, convert it, and re-upload the corresponding secret: kubectl get --export -o json cm [configmap name] | jq 'with_entries(if .key == "data" then .value=(.value | to_entries | map( { (.key): (.value|@base64) } ) | add ) elif .key == "kind" then .value="Secret" else . end)' > secret.json; kubectl create -f secret.json Show Sample Output
This is sample output - yours may be different.
```
{
  "apiVersion": "v1",
  "kind": "Secret",
  "metadata": {
    "name": "example"
  },
  "data": {
    "EXAMPLE_DATA": "ZXhhbXBsZSB2YWx1ZSAx",
    "EXAMPLE_DATA_TWO": "ZXhhbXBsZSB2YWx1ZSAy"
  }
}
```
0

cat configmap.json | jq 'with_entries(if .key == "data" then .value=(.value | to_entries | map( { (.key): (.value|@base64) } ) | add ) elif .key == "kind" then .value="Secret" else . end)'

tyzbit · 2017-12-11 19:18:25 23
check open network port with cat

Trying to check for an open port and missing netcat or nmap? This is the lowest common denominator way to verify a port is accessible from one server to another. This will give you a pretty quick return of 0 if it works. If it fails, it will just hang and takes awhile to timeout. I usually ctrl+c the command. "echo ?$" will give you an exit code other then 0 after you exit. Show Sample Output
This is sample output - yours may be different.
```
cat < /dev/null > /dev/tcp/www.msn.com/89; echo $?
cat < /dev/null > /dev/tcp/8.8.8.8/53; echo $?
```
0

cat < /dev/null > /dev/tcp/<hostname or ip>/<port>; echo $?

pborowicz · 2018-02-14 15:51:51 36
Check the total memory usage of processes with a specific name

Get the total RESIDENT memory used by processes of a specific name. This means this is the MINIMUM used by a process, but some memory could be paged out to swap. Show Sample Output
This is sample output - yours may be different.
```
$ pids=$(pidof chrome); for p in ${pids[@]}; do cat /proc/$p/status | grep -i vmrss | awk '{print $2}'; done | while read m; do let t=$t+$m; echo $t; done | echo "$(tail -n 1) kB"
12613760 kB
```
0

pids=$(pidof chrome); for p in ${pids[@]}; do cat /proc/$p/status | grep -i vmrss | awk '{print $2}'; done | while read m; do let t=$t+$m; echo $t; done | echo "$(tail -n 1) kB"

tyzbit · 2018-04-08 16:43:35 160
check squid logs for time value greater than 9000ms
This is sample output - yours may be different.
0

cat squid.log| awk -v x=9000 '$2 >=x' | sort -hs| tail -n 100

calicowboy54 · 2018-04-11 21:04:20 154
Parallel Apache Benchmark

(echo "https://example.com/"; echo "https://example.com/"; echo "https://example.com/"; echo "https://example.com/") | parallel -k 'ab -n 10000 -c 15 {}'
This is sample output - yours may be different.
0

cat url_list.txt | parallel -k 'ab -n 10000 -c 15 {}'

emphazer · 2018-05-17 11:23:28 209
Use JQ to get a csv list of assets in aws with security groups, names, and ENI ID for tracking VPC Flows from JSON

You need to use the aws ec2 describe instances to get the JSON file. Show Sample Output
This is sample output - yours may be different.
```
"1.1.1.1","sg-9bc42fed","private-my-groupname","eni-81519d01","qa-myserver-1.pholem-earth.com","i-0129e27fa464a213c"
"2.2.2.2","sg-93b42b1c","another-security-group","eni-31c53b29","gc-myadmin-server-2.pholem-earth.com","i-0b5ac9579a692f987"
```
0

cat aws.json | jq -r '.Reservations[].Instances[] | [.PrivateIpAddress, .SecurityGroups[].GroupId,.SecurityGroups[].GroupName,.NetworkInterfaces[].NetworkInterfaceId,(.Tags[] | select(.Key =="Name") | .Value),([.InstanceId| tostring] | join(";"))]|@csv'

symgryph · 2018-08-08 19:22:58 337
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Pronounce an English word using Merriam-Webster.com

Looks up a word on merriam-webster.com, does a screen scrape for the FIRST audio pronunciation and plays it. USAGE: Put this one-liner into a shell script (e.g., ~/bin/pronounce) and run it from the command line giving it the word to say: $ pronounce lek If the word isn't found in merriam-webster, no audio is played and the script returns an error value. However, M-W is a fairly complete dictionary (better than howjsay.com which won't let you hear how to pronounce naughty words). ASSUMPTIONS: GNU's sed (which supports -r for extended regular expressions) and Linux's aplay. Aplay can be replaced by any program that can play .WAV files from stdin. KNOWN BUGS: only the FIRST pronunciation is played, which is problematic if you wanted a particular form (plural, adjectival, etc) of the word. For example, if you run this: $ pronounce onomatopoetic you'll hear a voice saying "onomatopoeia". Playing the correct form of the word is possible, but doing so might make the screen scraper even more fragile than it already is. (The slightest change to the format of m-w.com could break it).

Find usb device in realtime

Using this command you can track a moment when usb device was attached.

Archive all SVN repositories in platform indepenent form

Use of hotcopy for safety/stability of the backups.

Edit a file inside a compressed archive without extracting it

If you vim a compressed file it will list all archive content, then you can pickup any of them for editing and saving. There you have the modified archive without any extra step. It supports many file types such as tar.gz, tgz, zip, etc.

Given a file path, unplug the USB device on which the file is located (the file must be on an USB device !)

You have an external USB drive or key. Apply this command (using the file path of anything on your device) and it will simulate the unplug of this device. If you just want the port, just type : echo $(sudo lshw -businfo | grep -B 1 -m 1 $(df "/path/to/file" | tail -1 | awk '{print $1}' | cut -c 6-8) | head -n 1 | awk '{print $1}' | cut -c 5- | tr ":" "-")

Simulate typing

This will output the characters at 10 per second.

Recursively find top 20 largest files (> 1MB) sort human readable format

from my bashrc ;)

Puts every word from a file into a new line

Simply translates whitespace to newlines. Could be enhanced to compress out extra newlines, but that might be better handled in the next tool down the pipe, with eg uniq(1).

Massive change of file extension (bash)

Using bash parameters expansion

use SHIFT + ALT to toggle between two keyboard layouts

change the last two-character abbreviation to any layout abbreviation you want. This command will only run in the current session, add to your ~/.bashrc to make this permanent.

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Commands using cat (514)

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