You can use optipng for doing this and you should use the following commands because this is a command line image optimization.
1. yum install optipng
2. optipng [options] input.png
exiftool -all= foo.jpg
To find out what version of Linux (distro) you are running, enter the following command at the shell prompt:
j=1;for i in *; do mv "$i" file"$j".txt; let j=j+1;done
Always the permission of folders and files must be set because of the security reasons.
* * * * * bash /home/USER_NAME/public_html/backup.sh >/dev/null 2>&1
This will show you usage before Drop caches and after it, just copy / paste to your SSH Terminal window and execute.
Please be aware not to run while MySQL and Apache are running and while you run any process so it don’t stop.
free -m ; echo 1 > /proc/sys/vm/drop_caches ; free -m
Sometimes you can see lots of files into /tmp folder. You can remove the files with the linux remove command but it cannot be comfortable. You cannot monitor it always.
You can start, stop and restart Imap service with single line command on linux terminal.