Shell Bash determines whether a file or folder exists

Shell Bash determines whether a file or folder exists1, #如果文件夹不存在, create Folders folder="Log"if[!-D"${folder}" ]; Then mkdir ${folder}fi2To determine if a file exists.="/var/www/log.txt"# -The f parameter determines whether the $file existsif[!-F"$file" ]; Then Touch"$file"Fi,3、# -n Determine if a variable has a valueif[!-N"$var" ]; Then Echo"$var is empty"Exit0F4# Determine if two variables are equalif["$var 1"="$var 2" ]; Then Echo'$var 1 eq $var 2'ElseEcho'$var 1 not EQ $var 2'fi

Shell Bash determines whether a file or folder exists