Commands tagged Linux sorted by votes

Commands tagged Linux (266)

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AllInOne package maintainance

# AllInOne: Update what packages are available, upgrade to new versions, remove unneeded packages # (some are no longer needed, replaced by the ones from ap upgrade), check for dependencies # and clean local cached packages (saved on disk but not installed?,some are needed? [this only cleans unneeded unlike ap clean]). # aliases (copy into ~/.bashrc file): alias a='alias' a ap='apt-get' a r='ap autoremove -y' a up='ap update' a u='up && ap upgrade -y --show-progress && r && ap check && ap autoclean' # && means "and run if the previous succeeded", you can change it to ; to "run even if previous failed". I'm not sure if ap check should be before or after ap upgrade -y, you can also change the alias names. # To expand aliases in bash use ctrl alt e or see this ow.ly/zBKHs # For more useful aliases go to ow.ly/zBMOx
This is sample output - yours may be different.
0

apt-get update && apt-get dist-upgrade -y --show-progress && apt-get autoremove -y && apt-get check && apt-get autoclean -y

unixmonkey78577 · 2014-07-26 12:18:57 6
Send a message to Kodi (XBMC)

Send a text message to an Kodi (XBMC) device. Uses curl to post a JSON request to the Kodi JSON-RPC API.
This is sample output - yours may be different.
0

curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","method":"GUI.ShowNotification","params":{"title":"This is the title of the message","message":"This is the body of the message"},"id":1}' http://i3c.pla.lcl:8080/jsonrpc

PLA · 2014-08-24 21:49:13 29
10 files backup rotate in crontab

this command can be added to crontab so as to execute a nightly backup of directories and store only the 10 last backup files.
This is sample output - yours may be different.
0

for file in $(find /var/backup -name "backup*" -type f |sort -r | tail -n +10); do rm -f $file; done ; tar czf /var/backup/backup-system-$(date "+\%Y\%m\%d\%H\%M-\%N").tgz --exclude /home/dummy /etc /home /opt 2>&- && echo "system backup ok"

akiuni · 2014-09-24 14:04:11 10
extract and initrd image

this command extracts an initrd files into the "tmp" directory
This is sample output - yours may be different.
0

mkdir tmp ; cd tmp ; zcat ../initrd.gz | cpio -i

akiuni · 2014-09-24 14:06:38 30
return external ip

Also resolves hostname
This is sample output - yours may be different.
0

nslookup . ifcfg.me

Eun · 2014-11-17 09:35:28 7
Detect encoding of a text file
This is sample output - yours may be different.
0

uchardet <filename>

fltman · 2014-11-28 07:47:13 7
df without line wrap on long FS name

To be OS independent you should try df -Pk first (Linux) and if it does not work (that's the ||) then use df -k (e.g. for Solaris, HP UX, AIX). To get the output in a single line, use the additional cat.
This is sample output - yours may be different.
0

(df -Pk 2>/dev/null|| df -k) | cat

ffeldhaus · 2015-01-15 22:38:36 9
Multiple level ssh

If you are on machine 1 and want to ssh into machine 3, but you can only do so from machine 2, this will do it all in one go. Note that once you are on machine 3 and exit () it will take you directly back to machine 1
This is sample output - yours may be different.
0

ssh -t user@domain.com "ssh -t user2@domain2.com bash -l"

texasflood · 2015-02-11 16:15:01 10
Run bash script from web

Use this command to execute the contents of http://www.example.com/automation/remotescript.sh in the local environment. The parameters are optional. Alterrnatives to wget: CURL: curl -s http://www.example.com/automation/remotescript.sh | bash /dev/stdin param1 param2 W3M: w3m -dump http://www.example.com/automation/remotescript.sh | bash /dev/stdin [param1] [param2] LYNX: lynx -source http://www.example.com/automation/remotescript.sh | bash /dev/stdin [param1] [param2]
This is sample output - yours may be different.
0

wget -q -O - http://www.example.com/automation/remotescript.sh | bash /dev/stdin parameter1 parameter2

paulera · 2015-02-16 16:55:09 16
Copy the partition table from /dev/sda to /dev/sdb

Copy the partition table from /dev/sda to /dev/sdb. Be careful to get your drive names right.
This is sample output - yours may be different.
0

sfdisk -d /dev/sda | sudo sfdisk /dev/sdb

shanglin · 2015-03-10 18:11:10 9
Get all shellcode on binary file from objdump
This is sample output - yours may be different.
0

echo "\"$(objdump -d BINARY | grep '[0-9a-f]:' | cut -d$'\t' -f2 | grep -v 'file' | tr -d " \n" | sed 's/../\\x&/g')\""

reiderroque · 2015-09-25 20:21:26 11
Search entire web server for preg_replace /e based php malware.
This is sample output - yours may be different.
0

find / -name \*.php -exec grep -Hn preg_replace {} \;|grep /e|grep POST

UnklAdM · 2015-10-28 16:10:23 10
show number of established TCP connections
This is sample output - yours may be different.
0

ss -s | sed -n '/.*estab $[0-9]*$.*/s//\1/p'

phrik · 2015-12-08 12:35:22 11
Bulk change of mail domains in Rainloop

I had to reconfigure all of my 150 domains to use "localhost" as IMAP/SMTP server instead of mail.[domain]. This little thing did the job in a fraction of a second!
This is sample output - yours may be different.
0

sed -i -E 's/mail\..*/localhost\"/g' *

Blagus · 2016-01-15 14:48:32 10
Test remote SSH server status using telnet (no login required)

This command telnet and and looks for a line starting with "SSH" - works for OpenSSH since the SSH banner is something like "SSH-2.0-OpenSSH_6.0p1 Debian-4+deb7u3". Then it triggers an action accordingly. It can be packed as a script file to echo 0/1 indicating the SSH service availability: if [[ "$(sleep 1 | telnet -c <host> <port> 2>&1 | grep '^SSH')" == SSH* ]]; then echo 1; else echo 0; fi; Alternative uses: Trigger an action when server is UP (using &&): [[ "$(sleep 1 | telnet -c <host> <port> 2>&1 | grep '^SSH')" == SSH* ]] && <command when up> Trigger an action when server is DOWN (using ||): [[ "$(sleep 1 | telnet -c <host> <port> 2>&1 | grep '^SSH')" == SSH* ]] || <command when down>
This is sample output - yours may be different.
0

$if [[ "$(sleep 1 | telnet -c <host> <port> 2>&1 | grep '^SSH')" == SSH* ]]; then <command when up>; else <command when down>; fi;

paulera · 2016-02-02 13:06:51 16
List latest 5 modified files recursively

This command will find any named file types in / between two dates then will list all the metadata of those files in long format and human readable form. Adding a 't' flag to the ls command sorts the files by modified time. After all that the head -5 lists the first 5 which can be changed.
This is sample output - yours may be different.
0

ls -laht `find / -name "*.*" -type f -newermt "2016-04-05" ! -newermt "2016-04-10"`|head -5

ubercoo · 2016-04-19 14:26:23 10
Diff two directories by finding and comparing the md5 checksums of their contents.

As output, checksums and filenames will be printed.
This is sample output - yours may be different.
0

diff <(sort <(md5deep -r /directory/1/) | awk -F '/' '{print $1 $NF}') <(sort <(md5deep -r /directory/2/) | awk -F '/' '{print $1 $NF}')

linux_noob · 2016-06-06 20:05:01 11
better forkbomb (*DO NOT USE*)

Don't use. This defines a function `:` that will create two more of itself, infinitely in the background. While this function is itself defined in the background, it is run up in the front.
This is sample output - yours may be different.
0

:(){ :|:& }&:

tox123 · 2016-08-05 15:45:10 14
Diff two directories by finding and comparing the md5 checksums of their contents.

Results will be shown in columns. Only different files and files in one directory that is not in the other will be shown.
This is sample output - yours may be different.
0

diff -y --suppress-common-lines <(sort -k2 <(md5deep -r -b directory1)) <(sort -k2 <(md5deep -r -b directory2))

MeLoPasoPipa · 2016-08-18 09:17:16 12
Sum file sizes of found files
This is sample output - yours may be different.
0

find . -mtime +30 -exec ls -all "{}" \; | awk '{COUNTER+=$5} END {SIZE=COUNTER/1024/1024; print "size sum of found files is: " SIZE "MB"}'

breign · 2016-10-28 08:05:57 16
copy one partition to another with progress

uses the wonderful 'pv' command to give a progress bar when copying one partition to another. Amazing for long running dd commands Show Sample Output
This is sample output - yours may be different.
```
1.18TiB 9:24:52 [  38MiB/s] [===================================================================================>      ] 94% ETA 0:35:27
```
0

pv -tpreb /dev/sdc2 | dd of=/dev/sdb2 bs=64K conv=noerror,sync

4fthawaiian · 2016-12-22 03:18:09 14
Find the top most 5 duplicate files in a folder

To allow recursivity : find -type f -exec md5sum '{}' ';' | sort | uniq -c -w 33 | sort -gr | head -n 5 | cut -c1-7,41- Display only filenames : find -maxdepth 1 -type f -exec md5sum '{}' ';' | sort | uniq -c -w 33 | sort -gr | head -n 5 | cut -c43- Show Sample Output
This is sample output - yours may be different.
```
     50 ./file17.txt
     32 ./file44.txt
     11 ./file72.txt
      5 ./file29.txt
      3 ./file53.txt
```
0

find -maxdepth 1 -type f -exec md5sum '{}' ';' | sort | uniq -c -w 33 | sort -gr | head -n 5 | cut -c1-7,41-

MaDCOw · 2017-02-09 11:36:31 18
PulseAudio: set the volume via command line

Command to raise the volume. From https://wiki.archlinux.org/index.php/PulseAudio#Keyboard_volume_control
This is sample output - yours may be different.
0

pactl set-sink-mute 0 false ; pactl set-sink-volume 0 +5%

MaxLanar · 2017-05-13 13:02:50 17
Compare directories (using cmp to compare files byte by byte) to find files of the same name that differ

Compare the content of the files in the current directory with files of the same name in the duplicate directory. Pop Quiz: You have a duplicate of a directory with files of the same name that might differ. What do you do? You could use diff to compare the directories, but that's boring and it isn't as clever as find -print0 with xargs. Note: You must omit stderr redirect 2>/dev/null to see the list of missing files from DUPDIR, if any. Hint: Redirect stderr to a new file to produce a more readable list of files that are missing from DUPDIR. Warning: This doesn't tell you if DUPDIR contains files not found in the current directory so don't delete DUPDIR. Show Sample Output
This is sample output - yours may be different.
```
./DIFFER.PNG /DUPDIR/./DIFFER.PNG differ: char 59, line 3
cmp: /DUPDIR/./NOMATCH.PNG: No such file or directory
```
0

find . -maxdepth 1 -mindepth 1 -print0 | xargs -0 -n 1 -I % cmp % /DUPDIR/% 2>/dev/null

RiskNerd · 2018-07-08 02:25:57 256
Select to character in visual mode
This is sample output - yours may be different.
0

Vja<character>

minademian · 2018-12-14 11:01:40 28
‹ First < 7 8 9 10 11 >

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Perform sed substitution on all but the last line of input

In this simple example the command will add a comma to the end of every line except the last. I found this really useful when programatically constructing sql scripts. See sample output for example.

grep for minus (-) sign

Use flag "--" to stop switch parsing

Install pip with Proxy

Installs pip packages defining a proxy

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"

File rotation without rename command

Rotates log files with "gz"-extension in a directory for 7 days and enumerates the number in file name. i.e.: logfile.1.gz > logfile.2.gz I needed this line due to the limitations on AIX Unix systems which do not ship with the rename command.

Make vim open in tabs by default (save to .profile)

I always add this to my .profile rc so I can do things like: "vim *.c" and the files are opened in tabs.

Empty a file

For when you want to flush all content from a file without removing it (hat-tip to Marc Kilgus).

Find pages returning 404 errors in apache logs

Finds the top ten pages returning an http response code of 404 in an apache log.

Rename files in batch

url redirect tracer with curl

tracing redirects for a given url shortener

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Commands tagged Linux (266)

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