Same useful shell commands

shell_tips.sh

#!/usr/bin/env bash
# help set
set -e  # Exit immediately if a command exits with a non-zero status.
set -x  # Print commands and their arguments as they are executed.

# Export same evironment as process has
strings /proc/$PID/environ

strings /proc/20316/environ | awk '{ print "export "$1}' >> export_env.sh
source export_env.sh

# same as above but escape variables in double quotes
strings /proc/20316/environ | awk -F '=' '{printf "export %s=\"%s\"\n", $1, $2}' > export_env.sh

# Do not save history of current shell
history -c
# remove previous history
rm ~/.bash_history


# bash operators and conditions
# Return true if a bash variable is unset or set to the empty string: if [ -z "$var" ];