General Snippets¶
Disable SSH Login Welcome Message¶
To disable
touch ~/.hushlogin
To re-enable
rm -rf ~/.hushlogin
Change Sudo Password Requirement Timeout In Linux¶
To change sudo password timeout limit in Linux, run:
sudo visudo
This command will open the /etc/sudoers file in nano editor.
Find the following line:
Defaults env_reset
Change it like below the 30 is the number of minutes you want to set the timeout to.
Defaults env_reset, timestamp_timeout=30
Redirect Output to a File and Stdout With tee¶
The command you want is named tee:
foo | tee output.file
For example, if you only care about stdout:
ls -a | tee output.file
If you want to include stderr, do:
program [arguments...] 2>&1 | tee outfile
2>&1 redirects channel 2 (stderr/standard error) into channel 1 (stdout/standard output), such that both is written as stdout. It is also directed to the given output file as of the tee command.
Furthermore, if you want to append to the log file, use tee -a as:
program [arguments...] 2>&1 | tee -a outfile
Add Permanent Path to Application¶
First find the location of the Application/Service:
find / -name ApplicationName
Go to the path where the application is located
cd "../../../ApplicationName"
Run this command for ZSH:
echo 'export PATH="'$(pwd)':$PATH"' >> ~/.zshrc && source ~/.zshrc
Run this command for "shell Profile":
echo 'export PATH="'$(pwd)':$PATH"' >> ~/.profile && source ~/.profile
Run this command for "shell":
echo 'export PATH="'$(pwd)':$PATH"' >> ~/.shellrc && source ~/.shellrc
Create Symbolic Links¶
To create a symbolic link in Unix/Linux, at the terminal prompt, enter:
ln -s source_file target_file
to remove symbolic link use the rm command on the link
Open Last Edited File¶
less `ls -dx1tr /usr/local/cpanel/logs/cpbackup/*|tail -1`
Kill Process That Runs More Than X Time¶
Kill cgi after 30 secs:
for i in `ps -eo pid,etime,cmd|grep cgi|awk '$2 > "00:30" {print $1}'`; do kill $i; done