Shell Scripts on Linux

This page tells you some shell programming command that are must known.

References: Linux / Unix Command: sh

Commands	Meanings	Examples
"$#"	(#) - Expands to the number of positional parameters in decimal.	"$#" -eq 3
-f	(-f file) True if file exists and is a regular file.	-f "$1"
-Z	(-z string) True if the length of string is zero.	-Z "$1"
-d	(-d file) True if file exists and is a directory.	-d "${RSYNC_PATH3}/dberr"
-x	(-x file) True if file exists and is executable.	-X "${RSYNC_PATH3}/xxxxx.sh"