Unix Command Cheatsheet - kdaisho/Blog GitHub Wiki

fold

# wrap 20 characters width while respecting word
git log | fold -sw 20

# output
924e30fe88f002e57b20
252e774d217d0dc58e32
Author: Daisho 
Komiyama 
<daishokomiyama@gmai
l.com>
Date:   Sat Nov 23 
11:51:41 2024 -0500
...

# wrap 20 characters width
git log | fold -w 20

# output
commit 924e30fe88f00
2e57b20252e774d217d0
dc58e32
Author: Daisho Komiy
ama <daishokomiyama@
gmail.com>
Date:   Sat Nov 23 1
1:51:41 2024 -0500

    Disable msal
...

head

Print the first 10 characters of git log

git log | head -c 10

# output
commit 924%

# Add a newline at the end of output
git log | head -c 10; echo

# output
commit 924

Print the first three lines of git log

git log | head -n 3

# output
commit 924e30fe88f002e57b20252e774d217d0dc58e32
Author: Daisho Komiyama <[email protected]>
Date:   Sat Nov 23 11:51:41 2024 -0500

List all files

find ./

Count number of files under the current directory

find ./ -type f | wc -l

Count number of directories under the current directory

find ./ -type d | wc -l

List active ports

lsof -i -P -n | grep LISTEN

-i = internet files or sockets

Print processes on port 3000

lsof -i tcp:3000

-i = internet files or sockets

Kill a process running on a particular port (e.g., 8080)

kill -9 $(sudo lsof -t -i:8080)

Grep

grep -ir "console" .

-i = case insensitive
-r = search recursively)\

zgrep FILE

(search inside gzip file)

Find running node process

ps aux | grep node

(a = show processes for all users, u = display the process's user/owner, x = also show processes not attached to a terminal)