Commands using cat sorted by votes

Commands using cat (514)

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automate web search and open tabs in firefox

tired of opening tabs and fill in search forms by hand? just pipe the search terms you need into this surfraw loop. you can use any browser you have installed, but a graphical browser with a tabbed interface will come in handy. surfraw can be found here: http://surfraw.alioth.debian.org
This is sample output - yours may be different.
-1

cat search_items.txt | while read i; do surfraw google -browser=firefox $i; done

bubo · 2011-05-12 09:27:08 2
How many lines does the passwd file have?
This is sample output - yours may be different.
-1

cat /etc/passwd | wc -l

wilbercarmona · 2011-06-03 00:05:20 26
Find Out My Linux Distribution Name and Version
This is sample output - yours may be different.
-1

if [ -x /etc/*-release ]; then cat /etc/*-release ; else cat /etc/*-version ; fi

hugoeustaquio · 2011-06-22 14:09:24 3
Generat a Random MAC address

I liked vaporub's suggestion, here a little simplification of the sed command.
This is sample output - yours may be different.
-1

MAC=$((date +'%Y%m%d%H%M%S%N'; cat /proc/interrupts) | md5sum | sed -r 's/(..)/\1:/g' | cut -d: -f 1-6)

jazznjam · 2011-07-14 13:11:50 3
Remove color codes (special characters) with sed
This is sample output - yours may be different.
-1

cat input.txt | sed 's/\\\033[^a-zA-Z]*.//g'

lingo · 2011-08-02 05:27:36 4
share single file in LAN via netcat
This is sample output - yours may be different.
-1

while :; do cat file.txt | nc -l 80; done

kev · 2011-09-15 13:16:20 5
Per country GET report, based on access log. Easy to transform to unique IP

Per country GET report, based on access log. Easy to transform to unique IP Show Sample Output
This is sample output - yours may be different.
```
     71 , Poland
    116 , France
    300 , United States
   2426 , Spain
```
-1

cat /var/log/nginx/access.log | grep -oe '^[0-9.]\+' | perl -ne 'system("geoiplookup $_")' | grep -v found | grep -oe ', [A-Za-z ]\+$' | sort | uniq -c | sort -n

theist · 2012-05-08 13:28:25 3
Copy public ssh Id to new host withtout bash redirection
This is sample output - yours may be different.
-1

cat .ssh/id_dsa.pub | ssh <HOST> "mkdir -p .ssh && tee -a .ssh/authorized_keys"

Valise · 2012-10-11 12:12:45 7
Extract single table from a MySQL dump

Given a dump.sql file, extract table1 creation and data commands. table2 is the one following table1 in the dump file. You can also use the same idea to extract several consecutive tables.
This is sample output - yours may be different.
-1

cat dump.sql | sed -n -e '/Table structure for table .table1./,/Table structure for table .table2./p'

infojunkie · 2012-11-22 23:54:04 5
Easily find an old command you run
This is sample output - yours may be different.
-1

cat $HISTFILE | grep command

Stolas · 2013-05-01 13:11:05 7
Compare a remote file with a local file

Or, if you have restricted access for sftp only, I think you can still do this: diff /path/to/localfile <(scp user@host:/path/to/remotefile >(cat))
This is sample output - yours may be different.
-1

diff /path/to/localfile <(ssh user@host cat /path/to/remotefile)

mc0e · 2013-05-24 09:24:31 8
dd if=/dev/null of=/dev/sda

Exactly the same effect with 3 less characters ;-) (Removes all files/filesystems of a harddisk. It removes EVERYTHING of your hard disk. Be careful when to select a device.) You can press Ctrl + C after few seconds (No output)
This is sample output - yours may be different.
-1

cat /dev/zero > /dev/sda

fhh · 2013-09-13 21:47:48 7
Processes biglion quantity of sold ebay coupons/bonus codes

Processes biglion quantity of sold ebay coupons/bonus codes, so you can know approximate count of users who buyed the coupons and when sales are come up again. You can change sleep parameter so script will work slowly or faster (default is 5 seconds). Additional requirements: curl Standart tools used: awk, date, cat, grep (bash) Show Sample Output
This is sample output - yours may be different.
```
Fri Nov  8 12:32:03 UTC 2013
9518

Fri Nov  8 12:32:08 UTC 2013
9518
```
-1

while true; do date; (curl -s -o 1.html http://www.biglion.ru/deals/ebay-80/ &); sleep 5; cat 1.html | grep "купонов" | awk -F"<div>" '{print $2}' | awk -F"<span>" '{print $1}'; done

sxiii · 2013-11-08 12:40:05 7
find and output files content with filtering by filename and specific string
This is sample output - yours may be different.
-1

find . -name *.properties -exec /bin/echo {} \; -exec cat {} \; | grep -E 'listen|properties'

altern · 2014-02-17 02:25:49 7
Parse logs for IP addresses and how many hits from each IP
This is sample output - yours may be different.
-1

cat "log" | grep "text to grep" | awk '{print $1}' | sort -n | uniq -c | sort -rn | head -n 100

jmorganwalker · 2014-07-08 15:07:24 10
Monitors battery usage (rate of energy charge/discharge)

Needs to be run in a battery sysfs dir, eg. /sys/class/power_supply/BAT0 on my system. Displays the battery's current charge and the rate per-second at which energy is {dis,}charging. All values are displayed as percentages of "full" charge. The first column is the current charge. The second is the rate of change averaged over the entire lifetime of the command (or since the AC cable was {un,}plugged), and the third column is the rate of change averaged over the last minute (controlled by the C=60 variable passed to awk). The sample output captures a scenario where I ran 'yes' in another terminal to max out a CPU. My battery was at 76% charge and you can see the energy drain starts to rise above 0.01% per-second as the cpu starts working and the fan kicks in etc. While idle it was more like 0.005% per-second. I tried to use this to estimate the remaining battery life/time until fully charged, but found it to be pretty useless... As my battery gets more charged it starts to charge slower, which meant the estimate was always wrong. Not sure if that's common for batteries or not. Show Sample Output
This is sample output - yours may be different.
```
 76 -00.00570 -00.00688
 76 -00.00567 -00.00626
 76 -00.00585 -00.00751
 76 -00.00582 -00.00751
 76 -00.00589 -00.00813
 76 -00.00585 -00.00751
 76 -00.00602 -00.00876
 76 -00.00599 -00.00876
 76 -00.00606 -00.00939
 76 -00.00603 -00.00876
 76 -00.00619 -00.01001
```
-1

while cat energy_now; do sleep 1; done |awk -v F=$(cat energy_full) -v C=60 'NR==1{P=B=$1;p=100/F} {d=$1-P; if(d!=0&&d*D<=0){D=d;n=1;A[0]=B=P}; if(n>0){r=g=($1-B)/n;if(n>C){r=($1-A[n%C])/C}}; A[n++%C]=P=$1; printf "%3d %+09.5f %+09.5f\n", p*$1, p*g, p*r}'

sqweek · 2015-09-19 15:45:40 11
Watch Star Wars via telnet

If you don't have telnet, you can use the bash built-in tcp pipes.
This is sample output - yours may be different.
-1

cat < /dev/tcp/towel.blinkenlights.nl/23

kees · 2017-11-25 12:27:45 27
quick integer CPU benchmark

You could have that little benchmark run on all cores in parallel, as a multi-core benchmark or stress test First find the number of cores, then have parallel iterate over that in, well, parallel Show Sample Output
This is sample output - yours may be different.
```
...
41454625947560171969501001538543925124881846970621917597708878154881\
18278788738248093374936943243527734573872009289119068940335579136

real	0m12,698s
user	0m14,461s
sys	0m0,382s
```
-1

time cat /proc/cpuinfo |grep proc|wc -l|xargs seq|parallel -N 0 echo "2^2^20" '|' bc

kostis · 2018-12-06 05:36:55 1059
put nothing nowhere

Just waste some resources in a philosophical way
This is sample output - yours may be different.
-2

cat /dev/zero > /dev/null &

gustavold · 2009-03-02 18:18:52 11
easly monitor mem usage
This is sample output - yours may be different.
-2

watch -n1 --differences cat /proc/meminfo

hypnojazz · 2009-03-26 15:27:37 9
List SMTP connections by host

Searches /var/log/secure for smtp connections then lists these by number of connections made and hosts.
This is sample output - yours may be different.
-2

cat /var/log/secure | grep smtp | awk '{print $9}' | cut -f2 -d= | sort | uniq -c | sort -n | tail

empulse · 2009-03-30 15:49:54 7
Append output to the beginning of a file.

Adds the stdout (standard output) to the beginning of logfile.txt. Change "command" to whatever command you like, such as 'ls' or 'date', etc. It does this by adding the output to a temporary file, then adding the previous contents of logfile.txt to the temp file, then copying the new contents back to the logfile.txt and removing the temp file.
This is sample output - yours may be different.
-2

command > tmp && cat logfile.txt >> tmp && tmp > logfile.txt && rm tmp

akoumjian · 2009-04-05 22:00:32 12
Find the average QTime for all queries ran within the last hour for solr
This is sample output - yours may be different.
-2

cat /service/solr/log/main/current | tai64nlocal | grep "$`date '+%F %H'`\|`date '+%F %H %M' | awk '{print $1" 0"$2-1":"$3}'`$" | grep QTime | awk '{print $NF}' | awk -F\= '{ s += $2} END {print s/NR}'

allrightname · 2009-08-26 14:02:02 3
Checks apache's access_log file, strips the search queries and shoves them up your e-mail

It's not a big line, and it *may not* work for everybody, I guess it depends on the detail of access_log configuration in your httpd.conf. I use it as a prerotate command for logrotate in httpd section so it executes before access_log rotation, everyday at midnight.
This is sample output - yours may be different.
-2

cat /var/log/httpd/access_log | grep q= | awk '{print $11}' | awk -F 'q=' '{print $2}' | sed 's/+/ /g;s/%22/"/g;s/q=//' | cut -d "&" -f 1 | mail youremail@isp.com -s "[your-site] search strings for `date`"

isma · 2009-11-22 03:03:06 9
What Type of Computer Do You Have?

Prints the type of computer you have. I think this should be used more in distros and other applications because it is so easy to get. This can also be asked by tutorials as an easy way to get your base hardware. Some alternatives: sudo dmidecode -s system-product-name and sudo smbios-sys-info-lite | sed -n 's/^Product Name: *$.*$/\1/p' Show Sample Output
This is sample output - yours may be different.
```
Pangolin Performance
```
-2

cat /sys/devices/virtual/dmi/id/board_name

matthewbauer · 2010-04-22 03:21:40 9
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Create higher quality gif from videos

I had to compress it a bit to meet the 255 limit. See sample for full command (274) usage: ffgif foo.ext Supports 3 arguments (optional) ffgif filename seek_time time_duration scale ffgif foo 10 5 320 will seek 10 seconds in, convert for 5 seconds at a 320 scale. Default will convert whole video to gif at 320 scale. Inspiration - http://superuser.com/questions/556029/how-do-i-convert-a-video-to-gif-using-ffmpeg-with-reasonable-quality/556031#556031

check open ports without netstat or lsof

Show GCC-generated optimization commands when using the "-march=native" or "-mtune=native" switches for compilation.

You can tell GCC to automatically select optimization commands and produce optimized code for the local machine (the one compiling the code), but you can't normally see what switches have been selected and used unless you append a "-v" and pause compilation.

Create a visually twisted effect by alternating the direction of the "staples" effect vertically. The effect is achieved by moving odd-numbered lines from right to left and even-numbered lines from left to right.

The effect is achieved by moving odd-numbered lines from right to left and even-numbered lines from left to right. For odd-numbered lines (with an index j), the ((j + i) % 2 == 0) condition is satisfied. In this case, the line width is set to i, resulting in the line moving from left to right. For even-numbered lines, the ((j + i) % 2 == 0) condition is not satisfied. The line width is set to $(tput cols) - i, causing the line to move from right to left. This alternating direction of movement creates a twisted visual effect as the lines appear to move in opposite directions. The code runs in a continuous loop, repeatedly updating the lines with changing background colors. There is a slight pause of 0.05 seconds between each iteration to control the speed of the animation.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

print a file on a single line

Example: you have a package.txt you want to install on a system. Instead of this: cat package.txt package1 package2 package3 You want it to cat out on one line so you can print "yum install package1 package2 package3"

Find number of computers in domain, OU, etc .

Find usb device

I often use it to find recently added ou removed device, or using find in /dev, or anything similar. Just run the command, plug the device, and wait to see him and only him

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Send remote command output to your local clipboard

This command will copy command's output into your local clipboard

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Commands using cat (514)

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