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 16:43:35 158
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 21:04:20 152
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 11:23:28 207
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 19:22:58 336
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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

find the process that is using a certain port e.g. port 3000

Drop or block attackers IP with null routes

Someone might attack on your system. You can drop attacker IP using IPtables. However, you can use route command to null route unwanted traffic. A null route (also called as blackhole route) is a network route or kernel routing table entry that goes nowhere. Matching packets are dropped (ignored) rather than forwarded, acting as a kind of very limited firewall. The act of using null routes is often called blackhole filtering.

Convert files from DOS line endings to UNIX line endings

This method will also convert mac line endings.

Grabs the complete module list from CPAN, pulls the first column, ditches html lines, counts, ditches small namespaces.

Run TOP in Color, split 4 ways for x seconds - the ultimate ps command. Great for init scripts

One of my favorite ways to impress newbies (and old hats) to the power of the shell, is to give them an incredibly colorful and amazing version of the top command that runs once upon login, just like running fortune on login. It's pretty sweet believe me, just add this one-liner to your ~/.bash_profile -- and of course you can set the height to be anything, from 1 line to 1000! $ G=$(stty -g);stty rows $((${LINES:-50}/2));top -n1; stty $G;unset G Doesn't take more than the below toprc file I've added below, and you get all 4 top windows showing output at the same time.. each with a different color scheme, and each showing different info. Each window would normally take up 1/4th of your screen when run like that - TOP is designed as a full screen program. But here's where you might learn something new today on this great site.. By using the stty command to change the terminals internal understanding of the size of your terminal window, you force top to also think that way as well. # save the correct settings to G var. $ G=$(stty -g) # change the number of rows to half the actual amount, or 50 otherwise $ stty rows $((${LINES:-50}/2)) # run top non-interactively for 1 second, the output stays on the screen (half at least) $ top -n1 # reset the terminal back to the correct values, and clean up after yourself $ stty $G;unset G This trick from my [ http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html bash_profile ], though the online version will be updated soon. Just think what else you could run like this! Note 1: I had to edit the toprc file out due to this site can't handle that (uploads/including code). So you can grab it from [ http://www.askapache.com/linux-unix/bash-power-prompt.html my site ] Note 2: I had to come back and edit again because the links weren't being correctly parsed

Mirror rubygems.org

https://github.com/rubygems/rubygems-mirror/issues/20

Create black and white image

Use ImageMagick to create a "black and white" copy of an image.

An alarm clock using xmms2 and at

Nice little alarm clock to wake you up on time (hopefully). You can also do 'echo "vlc path/to/song" | at 6:00

repeat a command every one second

Short method of "while x=0; do foo ; sleep 1 ; done"

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Commands using cat (514)

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