snippets for linux commands like find and replace, nohup, scp

Find and chmod files or folders

find . -type d -exec chmod 755 {} \;
find . -type f -exec chmod 644 {} \;

Find a directory and display on screen

find . -type d -name 'linux' 2>/dev/null

Find/Grep for a string across multiple files with different extensions

find . -name "*.php" | xargs grep -niP 'thingy'
find \( -name "*js" -o -name "*jsp" -o -name "*jspf" \) | xargs grep -niP 'thingy'

Find and replace

find . -type f -name "*.php" -exec sed -i 's/numRows/rowCount/g' {} \;

running as background process

nohup scp <params> & > nohup.out 2 > &1
nohup scp -r -p root@www.example.com:/var/www/ /var/www/ & >nohup.out 2>&1
nohup scp -r -p root@www.example.com:/var/www/logs /var/www/ & >nohup.out 2>&1

Copying an image file to USB

cat file.iso > /dev/sdb
sync

Killing

killall -9 nginx

Mounting an imge file

mount -o loop file.img /mnt/image

Creating a file stsyem

mkfs.ext2 /dev/sdb2

Labeling a file system

e2label /dev/sdb2 RoboTamer

Searing bash history

history | grep -i "search term"

Debian Specific

See what is installed

dpkg -l | grep php5

Start a program

service program_name start

Stop a program

service program_name stop

Start a programs at boot time

insserv -d program_name

Remove program from boot time

insserv -r program_name