useful snippet for shell script

snippet.sh

# sed
sed -i "s/old/new/g" /path/to/file

# find
find . -name "*.log" -type f | while read f; do echo $f; done

# fine and delete
find . -name "*.pyc" -exec rm -f {} \;

# compress a dir and scp
tar zcvf - src/ | ssh user@server "cd /path/dst; tar zxvf -"

# find the parent process by child's pid
ps -o ppid= -p ${CHILDS_PID}