bash how_to tests Programming | Library | Reference - Code-Reference.com

bash: "How To" ... utilize tests

operation	what	code
string	variable equal to “xyz“	if [ $STR == “xyz” ]
	variable unequal to “xyz“	if [ $STR != “xyz” ]
	variable contains substring “xyz“	if [[ $STR =~ “xyz” ]]
	variable is in list “abc” or “def” (or …)	if [[ $STR =~ ^(“abc”\|“def”)$ ]]
integer	variable equal to n	if [ $STR -eq n ]
file	“node” exists (whatever type i.e. file, folder, …)	if [ -e “node” ]
	regular “filename” exists	if [ -f “filename” ]
	create unique temporary file	touch /tmp/$$.tmp
	find file “filename” with numerically largest extension in folder	ls -1d “filename.*” \| cut -d ”.” -f 2 \| sort -rg > /tmp/$$.tmp MAX=$(head -n 1 /tmp/$$.tmp)
execution	result of command execution	RSLT=$?
execution	being root	if ($(id -u) -eq 0))

work in progress