Show Menu
Cheatography
  1. Home >
  2. Programming >

Shell utilities & sytem management Cheat Sheet by

Various UNIX shell commands for programming, env and system management. Those commends are helpful, to me, but not often used. I had made this sheet to avoid periodically searching another time for the same thing.

ssh

sshfs [USER@­HOS­T]:­[re­mot­e_d­ire­ctory] mountpoint [options]
mount remote drive in 
mountpoint
 
ssh -o Server­Ali­veI­nte­rval=X -o Server­Ali­veC­oun­tMax=Y [HOST]
Maintaing ssh conection for
 X
seconds and 
Y
tries
 
ssh-co­py-id -i ~/.ssh­/id_rsa [USER@­HOST]
add autent­ication via ssh, not 
.pub
file
 
autossh -N -f -L localh­ost­:[P­ORT­U]:­loc­alh­ost­:[P­ORTR] [USER@­HOST]
map local port 
PORTU
to 
PORTR
on USER@HOST with autore­connect

operations on files & drives

cp -r $(<­fil­e_l­ist­ed.txt) outdir
copies files & direct­ories listed in 
file_l­ist­ed.txt
to 
outdir
 
xargs -a file_l­ist­ed.txt cp -r -t outdir
same as above
 
tar -(v)czf file.t­ar.gz /path/­to_­compres
create 
-cf
archive 
-xf
for extract
 
unzip file.zip -d file
unzip 
file.zip
to file directory (must exists before)
 
mkdir -p dir
make parent direct­ories as needed, no error
 
rm -r !(*.ext)
delete everything except files with extension 
.ext
 
du -hs dir
check size of dir use 
-h
for GB or 
-m
for MB
 
basename path/b­ase­nam­e.ext .ext
get 
basename
from 
path
without 
ext
 
grep -i -r -E 'patte­rn1­|pa­tte­rn2­|pa­ttern3'
multiple patterns with 
grep
-i
case insens­itive 
-r
recursive
 
find PATH -(i)name "­pat­ter­n" -type d/f
list 
f
files or 
d
direct­ories with matching 
pattern
in specified 
PATH
 

Statements

while read line; do [Command] done < input.file
Loop over file content
 
for file in ./*.ex­ten­tion; do [Command] done
loop over files in directory
 
if test -f file.txt; then [Command] fi
check if file exists 
-f
, 
-d
for directory
 
if [-f file.txt]; then [Command] fi
same different syntax
 
if [ -z "­$S1­" ]; then fi
checks if arg 
$1
is empty
 
function functi­on_name { <co­mma­nds> }
function declar­ation, 
$1
$2
- argument names
 
"­$?"
return exit status from last command
 
$(expr)
evaluate 
expr
and store/­print it's result

system

cat /proc/­cpuinfo #or lscpu
cpu inform­ations
 
uname -a
OS inform­ations
 
ss -tpln
show forwarded ports
 
lsblk -S
list block devices 
-S
for minimal view
 
dd if=/pa­­th­/­t­o/­­ima­­ge.iso of=/dr­­iv­e­/­lo­­cation bs=4M && sync
create bootable drive from 
image.iso
 
sudo mount [drive] [mount­­point]
mounts 
drive
at 
mount­­point
 
kill -9 $(pgrep -f [pattern])
terminate all processes matching 
pattern
 
printenv
print all env variables

git

git rm -r --cached <pa­th/­fil­e.e­xt>
remove untracked files
 
git clean -d -(n/f)
remove undone changes add: 
-n
to show files to remove or 
-f
to remove them
 
git fetch --all [branc­h_name]
copies all changes from last pull/clone on current branch or given 
branch name
 
git log --not --remotes
all commits on all branches that aren't pushed yet
 
git checkout -b <ne­w_b­ran­ch>
change & create new branch
 
git switch -c <ne­w_b­ran­ch>
same as above
                   
 

Metadata

  • Languages:
  • Published: 20th July, 2021
  • Last Updated: 20th December, 2022

Comments

No comments yet. Add yours below!

Add a Comment

Your Comment

Please enter your name.

    Please enter your email address

      Please enter your Comment.

          Related Cheat Sheets

          Bash Script Colors Cheat Sheet
          Git Commands Cheat Sheet
          Linux Every Day Commands Cheat Sheet