somarlyonks · July 7, 2023 09:54
diff --git a/du.sh b/du.sh
 # Show 20 biggest directories with 'K M G'
 du | \
 sort -r -n | \
 awk '{split("K M G",v); s=1; while($1>1024){$1/=1024; s++} print int($1)" "v[s]"\t"$2}' | \
 head -n 20
diff --git a/find.sh b/find.sh
 # Find files that have been modified on your system in the past 60 minutes
 find / -mmin 60 -type f

 # Find all files larger than 20M
 find / -type f -size +20M

 # Find duplicate files (based on MD5 hash)
 find -type f -exec md5sum '{}' ';' | sort | uniq --all-repeated=separate -w 33

 # Change permission only for files
 cd /var/www/site && find . -type f -exec chmod 766 {} \;
 cd /var/www/site && find . -type f -exec chmod 664 {} +

 # Change permission only for directories
 cd /var/www/site && find . -type d -exec chmod g+x {} \;
 cd /var/www/site && find . -type d -exec chmod g+rwx {} +

 # Find files and directories for specific user
 find . -user <username> -print

 # Find files and directories for all without specific user
 find . \!-user <username> -print

 # Delete older files than 60 days
 find . -type f -mtime +60 -delete

 # Recursively remove all empty sub-directories from a directory
 find . -depth  -type d  -empty -exec rmdir {} \;

 # How to find all hard links to a file
 find </path/to/dir> -xdev -samefile filename

 # Recursively find the latest modified files
 find . -type f -exec stat --format '%Y :%y %n' "{}" \; | sort -nr | cut -d: -f2- | head

 # Recursively find/replace of a string with sed
 find . -not -path '*/\.git*' -type f -print0 | xargs -0 sed -i 's/foo/bar/g'

 # Recursively find/replace of a string in directories and file names
 find . -depth -name '*test*' -execdir bash -c 'mv -v "$1" "${1//foo/bar}"' _ {} \;

 # Recursively find suid executables
 find / \( -perm -4000 -o -perm -2000 \) -type f -exec ls -la {} \;
diff --git a/grep.sh b/grep.sh
 # Search for a "pattern" inside all files in the current directory
 grep -rn "pattern"
 grep -RnisI "pattern" *
 fgrep "pattern" * -R

 # Remove blank lines from a file and save output to new file
 grep . filename > newfilename

 # Show only for multiple patterns
 grep 'INFO*'\''WARN' filename
 grep 'INFO\|WARN' filename
 grep -e INFO -e WARN filename
 grep -E '(INFO|WARN)' filename
 egrep "INFO|WARN" filename

 # Except multiple patterns
 grep -vE '(error|critical|warning)' filename

 # Show data from file without comments
 grep -v ^[[:space:]]*# filename

 # Show data from file without comments and new lines
 egrep -v '#|^$' filename

 # Show strings with a dash/hyphen
 grep -e -- filename
 grep -- -- filename
 grep "\-\-" filename
diff --git a/lsof.sh b/lsof.sh
 # Show process that use internet connection at the moment
 lsof -P -i -n

 # Show process that use specific port number
 lsof -i tcp:443

 # Lists all listening ports together with the PID of the associated process
 lsof -Pan -i tcp -i udp

 # List all open ports and their owning executables
 lsof -i -P | grep -i "listen"

 # Show all open ports
 lsof -Pnl -i

 # Show open ports (LISTEN)
 lsof -Pni4 | grep LISTEN | column -t

 # List all files opened by a particular command
 lsof -c "process"

 # View user activity per directory
 lsof -u username -a +D /etc

 # Show 10 largest open files
 lsof / | \
 awk '{ if($7 > 1048576) print $7/1048576 "MB" " " $9 " " $1 }' | \
 sort -n -u | tail | column -t

 #Show current working directory of a process
 lsof -p <PID> | grep cwd
diff --git a/mp42webm.sh b/mp42webm.sh
 ffmpeg -i input.mp4 -c:v libvpx -crf 10 -b:v 1M -c:a libvorbis output.webm
diff --git a/netstat.sh b/netstat.sh
 netstat -tn 2>/dev/null | grep :22
diff --git a/ps.sh b/ps.sh
 # Show a 4-way scrollable process tree with full details
 ps awwfux | less -S

 # Processes per user counter
 ps hax -o user | sort | uniq -c | sort -r

 # Show all processes by name with main header
 ps -lfC nginx
	# Show 20 biggest directories with 'K M G'
	du \| \
	sort -r -n \| \
	awk '{split("K M G",v); s=1; while($1>1024){$1/=1024; s++} print int($1)" "v[s]"\t"$2}' \| \
	head -n 20
	# Find files that have been modified on your system in the past 60 minutes
	find / -mmin 60 -type f

	# Find all files larger than 20M
	find / -type f -size +20M

	# Find duplicate files (based on MD5 hash)
	find -type f -exec md5sum '{}' ';' \| sort \| uniq --all-repeated=separate -w 33

	# Change permission only for files
	cd /var/www/site && find . -type f -exec chmod 766 {} \;
	cd /var/www/site && find . -type f -exec chmod 664 {} +

	# Change permission only for directories
	cd /var/www/site && find . -type d -exec chmod g+x {} \;
	cd /var/www/site && find . -type d -exec chmod g+rwx {} +

	# Find files and directories for specific user
	find . -user <username> -print

	# Find files and directories for all without specific user
	find . \!-user <username> -print

	# Delete older files than 60 days
	find . -type f -mtime +60 -delete

	# Recursively remove all empty sub-directories from a directory
	find . -depth -type d -empty -exec rmdir {} \;

	# How to find all hard links to a file
	find </path/to/dir> -xdev -samefile filename

	# Recursively find the latest modified files
	find . -type f -exec stat --format '%Y :%y %n' "{}" \; \| sort -nr \| cut -d: -f2- \| head

	# Recursively find/replace of a string with sed
	find . -not -path '/\.git' -type f -print0 \| xargs -0 sed -i 's/foo/bar/g'

	# Recursively find/replace of a string in directories and file names
	find . -depth -name 'test' -execdir bash -c 'mv -v "$1" "${1//foo/bar}"' _ {} \;

	# Recursively find suid executables
	find / \( -perm -4000 -o -perm -2000 \) -type f -exec ls -la {} \;
	# Search for a "pattern" inside all files in the current directory
	grep -rn "pattern"
	grep -RnisI "pattern" *
	fgrep "pattern" * -R

	# Remove blank lines from a file and save output to new file
	grep . filename > newfilename

	# Show only for multiple patterns
	grep 'INFO*'\''WARN' filename
	grep 'INFO\\|WARN' filename
	grep -e INFO -e WARN filename
	grep -E '(INFO\|WARN)' filename
	egrep "INFO\|WARN" filename

	# Except multiple patterns
	grep -vE '(error\|critical\|warning)' filename

	# Show data from file without comments
	grep -v ^[[:space:]]*# filename

	# Show data from file without comments and new lines
	egrep -v '#\|^$' filename

	# Show strings with a dash/hyphen
	grep -e -- filename
	grep -- -- filename
	grep "\-\-" filename
	# Show process that use internet connection at the moment
	lsof -P -i -n

	# Show process that use specific port number
	lsof -i tcp:443

	# Lists all listening ports together with the PID of the associated process
	lsof -Pan -i tcp -i udp

	# List all open ports and their owning executables
	lsof -i -P \| grep -i "listen"

	# Show all open ports
	lsof -Pnl -i

	# Show open ports (LISTEN)
	lsof -Pni4 \| grep LISTEN \| column -t

	# List all files opened by a particular command
	lsof -c "process"

	# View user activity per directory
	lsof -u username -a +D /etc

	# Show 10 largest open files
	lsof / \| \
	awk '{ if($7 > 1048576) print $7/1048576 "MB" " " $9 " " $1 }' \| \
	sort -n -u \| tail \| column -t

	#Show current working directory of a process
	lsof -p <PID> \| grep cwd
	# Show a 4-way scrollable process tree with full details
	ps awwfux \| less -S

	# Processes per user counter
	ps hax -o user \| sort \| uniq -c \| sort -r

	# Show all processes by name with main header
	ps -lfC nginx