Commands using cat sorted by votes

Commands using cat (514)

sorted by

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
‹ First < 14 15 16 17 18 > Last ›

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

view http traffic

Search and replace in multiple files recursively

Replace "foo" with "bar" in all files in current directory recursively

network usage per process

Nethogs groups bandwidth by process.

Determining the excat memory usages by certain PID

this command gives you the total number of memory usuage and open files by the perticuler PID.

cycle through a 256 colour palette

just for fun

get you public ip address

Relies on ifconfig.me functioning. It's about as easy as it gets, and memorable to old geeks too.

Shows what an RPM was compiled with.

\n Separates out the architectures on different lines.

Find usb device in realtime

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

Produce 10 copies of the same string

list files recursively by size

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for:

» all commands
» commands with 3 up-votes (commandlinefu3)
» commands with 10 up-votes (commandlinefu10)
» commands using cat

Commands using cat (514) the last day the last week the last month all time sorted by date votes

What's this?

Check These Out

Stay in the loop…

Commands using cat (514)

sorted by