Commands using cat sorted by votes

Commands using cat (514)

sorted by

convert JSON object to JavaScript object literal

install json-to-js as a npm global package
This is sample output - yours may be different.
0

cat data.json | json-to-js | pbcopy

minademian · 2018-12-14 15:55:41 42
Extract a Zip File from STDOUT with the Jar Command

Plain old `unzip` won't unzip output coming from STDOUT the ZIP file format includes a directory (index) at the end of the archive. This directory says where, within the archive each file is located and thus allows for quick, random access, without reading the entire archive. This would appear to pose a problem when attempting to read a ZIP archive through a pipe, in that the index is not accessed until the very end and so individual members cannot be correctly extracted until after the file has been entirely read and is no longer available. As such it appears unsurprising that most ZIP decompressors simply fail when the archive is supplied through a pipe. The directory at the end of the archive is not the only location where file meta information is stored in the archive. In addition, individual entries also include this information in a local file header, for redundancy purposes. From the `jar` manpage: > The jar command is a general-purpose archiving and compression tool, based on ZIP and the ZLIB compression format. JAR is smart enough to know how to handle these local file headers when the index is unavailable when reading through the pipe. (Most of the explanation in this description is taken from https://serverfault.com/a/589528/314226 , though they recommend using `bsdtar`, but that is not always available on systems) Show Sample Output
This is sample output - yours may be different.
```
?? cat foo.zip | jar xv 
extracted: foo/bae.txt
extracted: foo/bar.txt
extracted: foo/baz.txt
extracted: foo/boo.txt
```
0

cat foo.zip | jar xv

bbbco · 2019-01-14 22:08:19 33
SFTP upload through HTTPS proxy

Overwrites remote file without asking! Uses HTTPS proxy that supports CONNECT. Actually uses SSH and not SFTP to upload the file.
This is sample output - yours may be different.
0

cat myFile.json | ssh root@remoteSftpServer -o "ProxyCommand=nc.openbsd -X connect -x proxyhost:proxyport %h %p" 'cat > myFile.json'

casueps · 2020-01-22 11:00:20 107
remove junk

Especially good for exported ipython files Show Sample Output
This is sample output - yours may be different.
```
Remove comments and 2 enter marks
```
0

grep -v '^# In' viz.txt | cat -s > out.txt

shantanuo · 2022-06-08 04:01:11 507
MySQL: Filter out specific tables from an existing mysqldump file with awk

This command works only if the line "DROP TABLE IF EXISTS" exists for all tables in the mysqldump file. It acts like a state machine.
This is sample output - yours may be different.
0

cat db_dump.sql | awk '/DROP TABLE IF EXISTS/ { skip = $5 ~ /table1|table2/ } !skip { print $0 }' > db_dump_filtered.sql

stf42 · 2022-10-30 16:58:57 801
removing those pesky malformed lines at the end of a text file..

tells you the number of lines in said file, and then tail the last 100 lines ( or how many are messed up) then u take the total amount of lines and then subract the 100 or so lines u DONT WANT, then do a head -n $new_number and then redirect it to new file.db
This is sample output - yours may be different.
-1

cat -n $file | tail -n 100 && head -n number-of-lines-you-want-to-keep > newfile

bbelt16ag · 2009-02-15 01:02:10 9

View your motherboard's ACPI tables (in Debian & Ubuntu)

In July 2008, there was an uproar over Foxconn motherboards feeding Linux installs incorrect ACPI information (http://ubuntu-virginia.ubuntuforums.org/showthread.php?t=869249). Foxconn has gladly corrected their mistake, but make sure it's not happening on your motherboard! After running the command, just view the 'dsdt.dsl' in any editor you like. Show Sample Output

-1

sudo aptitude -y install iasl && sudo cat /sys/firmware/acpi/tables/DSDT > dsdt.dat && iasl -d dsdt.dat

brettalton · 2009-02-15 23:13:50 13

Load multiple sql script in mysql

Be aware of using the --password argument as it will appear your password in plain text on the screen. You may use -p argument instead, it will prompt you to enter you password in hidden mode.
This is sample output - yours may be different.
-1

cat schema.sql data.sql test_data.sql | mysql -u user --password=pass dbname

tristan_ph · 2009-03-24 08:39:40 6
Retrieve Plesk Admin Password

I'm sure almost everybody knows this by now. This command will pull the password for the admin login of any plesk machine. Show Sample Output
This is sample output - yours may be different.
```
[hostname.com]# cat /etc/psa/.psa.shadow
thisismylamepassword
```
-1

cat /etc/psa/.psa.shadow

jigglebilly · 2009-04-30 18:08:12 4
display portion of a file

This is useful for displaying a portion of a FILE that contains an error at line NUMBER
This is sample output - yours may be different.
-1

cat -n FILE | grep -C3 "^[[:blank:]]\{1,5\}NUMBER[[:blank:]]"

lv4tech · 2009-05-17 18:19:55 8
Create variables from a list of names

VARNAMES='ID FORENAME LASTNAME ADDRESS CITY PHONE MOBILE MAIL ...' cat customer.csv | while read LINE ; do COUNT=1 for VAR in $VARNAMES ; do eval "${VAR}=`echo $LINE | /usr/bin/awk {'print $'$COUNT''}`" let COUNT=COUNT+1 done done Maybe you have a CSV-File with addresses, where you have to process each contact (one per line, write each value to own variable). Of course you can define every variable, but this way is more simple and faster (to write). VARNAMES includes the variable names. Pay attention: the number of names in VARNAMES have to be the same than in the CSV-file the fields. If the CSV is not seperated with ";", you can set the seperator after the awk-binary with -F"_" for example.
This is sample output - yours may be different.
-1

VARNAMES='ID FORENAME LASTNAME ADDRESS CITY PHONE MOBILE MAIL' ; cat customer.csv | while read LINE ; do COUNT=1 ; for VAR in $VARNAMES ; do eval "${VAR}=`echo $LINE | /usr/bin/awk {'print $'$COUNT''}`" ; let COUNT=COUNT+1 ; done ; done

GeckoDH · 2009-05-19 11:23:00 4
cat large file to clipboard

avoid mouse abuse and the constant struggle of balancing scroll velocity ... not to mention that burning sensation in your upper right shoulder ....
This is sample output - yours may be different.
-1

cat large.xml | xclip

copremesis · 2009-07-08 16:30:07 8
use curl to resume a failed download

If you are downloading a big file (or even a small one) and the connection breaks or times out, use this command in order to RESUME the download where it failed, instead of having to start downloading from the beginning. This is a real win for downloading debian ISO images over a buggy DSL modem. Take the partially downloaded file and cat it into the STDIN of curl, as shown. Then use the "-C -" option followed by the URL of the file you were originally downloading. Show Sample Output
This is sample output - yours may be different.
```
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 17.1M  100 17.1M    0     0   746k      0  0:00:23  0:00:23 --:--:--  793k
```
-1

cat file-that-failed-to-download.zip | curl -C - http://www.somewhere.com/file-I-want-to-download.zip >successfully-downloaded.zip

linuxrawkstar · 2009-08-05 13:33:06 16
Capitalize the word with dd
This is sample output - yours may be different.
-1

echo capitalize | { dd bs=1 count=1 conv=ucase 2> /dev/null; cat ;}

twfcc · 2009-09-05 01:49:53 40
remove the last line of all html files in a directory

Some malicious program appends a iframe or script tag to you web pages on some server, use this command to clean them in batch.
This is sample output - yours may be different.
-1

for f in *.html; do head -n -1 $f > temp; cat temp > $f; rm temp; done

Sunng · 2009-10-12 12:49:18 5
prints line numbers

Yep, is hard, but is a way more flexible using pipe.
This is sample output - yours may be different.
-1

cat infile | while read str; do echo "$((++i)) - $str" ; done;

glaudiston · 2009-12-09 14:05:09 3
Get Memeory Info

Get Memeory Info
This is sample output - yours may be different.
-1

cat /proc/meminfo

svnlabs · 2010-01-22 16:48:03 3
Merge tarballs

You don't need to create an intermediate file, just pipe the output directly to tar command and use stin as file (put a dash after the f flag).
This is sample output - yours may be different.
-1

cat 1.tar.gz 2.tar.gz | tar zxvif -

psychopenguin · 2010-05-09 03:50:00 5
sed - match numbers between 1-100

-r to use extended regex ^ begin line | alternative get 100 or 0-9 one or two times Show Sample Output
This is sample output - yours may be different.
```
1
12
99
100
```
-1

cat file | sed -n -r '/^100$|^[0-9]{1,2}$/p'

voyeg3r · 2010-05-15 19:15:56 5
Quickly create simple text file from command line w/o using vi/emacs

thx Montecristo, thx hckhckhck
This is sample output - yours may be different.
-1

cat > {filename} {your text} [^C | ^D]

sphere64 · 2010-06-03 09:02:12 3

CPU architecture details

It works in every linux box Show Sample Output

This is sample output - yours may be different.

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 37
model name      : Intel(R) Core(TM) i3 CPU         530  @ 2.93GHz
stepping        : 2
cpu MHz         : 2926.109
cache size      : 4096 KB
physical id     : 0
siblings        : 4
core id         : 0
cpu cores       : 2
apicid          : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc nonstop_tsc arat pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips        : 5852.21
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management: [8]

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 37
model name      : Intel(R) Core(TM) i3 CPU         530  @ 2.93GHz
stepping        : 2
cpu MHz         : 2926.109
cache size      : 4096 KB
physical id     : 0
siblings        : 4
core id         : 0
cpu cores       : 2
apicid          : 1
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc nonstop_tsc arat pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips        : 5851.94
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management: [8]

processor       : 2
vendor_id       : GenuineIntel
cpu family      : 6
model           : 37
model name      : Intel(R) Core(TM) i3 CPU         530  @ 2.93GHz
stepping        : 2
cpu MHz         : 2926.109
cache size      : 4096 KB
physical id     : 0
siblings        : 4
core id         : 2
cpu cores       : 2
apicid          : 4
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc nonstop_tsc arat pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips        : 5851.94
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management: [8]

processor       : 3
vendor_id       : GenuineIntel
cpu family      : 6
model           : 37
model name      : Intel(R) Core(TM) i3 CPU         530  @ 2.93GHz
stepping        : 2
cpu MHz         : 2926.109
cache size      : 4096 KB
physical id     : 0
siblings        : 4
core id         : 2
cpu cores       : 2
apicid          : 5
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx rdtscp lm constant_tsc nonstop_tsc arat pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips        : 5851.95
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management: [8]

-1

cat /proc/cpuinfo

magicjohnson_ · 2010-09-24 09:27:58 3

Send and streamming video to web

Is a simple script for video streaming a movie
This is sample output - yours may be different.
-1

cat video.ogg | nc -l -p 4232 & wget http://users.bshellz.net/~bazza/?nombre=name -O - & sleep 10; mplayer http://users.bshellz.net/~bazza/datos/name.ogg

el_bazza · 2010-11-29 03:34:31 5
Join lines

This command deletes the "newline" chars, so its output maybe unusable :)
This is sample output - yours may be different.
-1

cat file | tr -d "\n"

uzsolt · 2010-12-02 09:22:02 3
Detect your computer's harddisk read speed without disk cache speed

Change your drive letter as you wish. Using pv command for speed detect.First of all you must install pv command for usage. http://www.bayner.com/ kerim@bayner.com Show Sample Output
This is sample output - yours may be different.
```
[55.6MB/s]
```
-1

cat /dev/sda | pv -r > /dev/null

kerim · 2011-01-23 22:58:56 5
view someone's twitter stream from terminal
This is sample output - yours may be different.
-1

grabtweets() { curl -s -o $GT_TMP twitter.com/$1 | cat $GT_TMP | grep entry-content | sed -e :loop -e 's/<[^>]*>//g;/</N;//bloop' | sed 's/^[ \t]*//'; }

gl101 · 2011-05-04 21:49:08 5
‹ First < 15 16 17 18 19 > 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

display ip address

add this alias in .bashrc to fast check the ip address of your modem router alias myip="curl -s http://myip.dk | grep '' | sed -e 's/]*>//g'"

Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

When was your OS installed?

Show time and date when you installed your OS.

Look for English words in /dev/urandom

Little faster alternative.

Convert from octal format to umask

Umask is obtained subtracting 7 from each cypher of octal format. I store octal perm format in an array,then for each element of array I subtract 7. The result is the umask.

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"

Emptying a text file in one shot

% = buffer d = delete

Efficient count files in directory (no recursion)

$ time perl -e 'if(opendir D,"."){@a=readdir D;print $#a - 1,"\n"}' 205413 real 0m0.497s user 0m0.220s sys 0m0.268s $ time { ls |wc -l; } 205413 real 0m3.776s user 0m3.340s sys 0m0.424s ********* ** EDIT: turns out this perl liner is mostly masturbation. this is slightly faster: $ find . -maxdepth 1 | wc -l sh-3.2$ time { find . -maxdepth 1|wc -l; } 205414 real 0m0.456s user 0m0.116s sys 0m0.328s ** EDIT: now a slightly faster perl version $ perl -e 'if(opendir D,"."){++$c foreach readdir D}print $c-1,"\n"' sh-3.2$ time perl -e 'if(opendir D,"."){++$c foreach readdir D}print $c-1,"\n"' 205414 real 0m0.415s user 0m0.176s sys 0m0.232s

Find all folder in /var that contains log in their path and have more than 10 files inside them, print the folder and the count

-L is for following symbolic links, it can be omitted and then you can find in your whole / dir

Find name of package which installed a given shell command

Some command names are very different from the name of the package that installed them. Sometimes, you may want to find out the name of the package that provided a command on a system, so that you can install it on another system.

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