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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
                   
 

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