Материал из Ksimute

Забываю их с завидной регулярностью, т.к. на баше пишу мало потом судорожно ищу в гугле. :)

Arithmetic Comparisons

 -lt	<
 -gt	>
 -le	<=
 -ge	>=
 -eq	==
 -ne	!=

пример скрипта

 #!/bin/bash
 # declare integers
 NUM1=2
 NUM2=2
 if [ $NUM1 -eq $NUM2 ]; then
 	echo "Both Values are equal"
 else 
 	echo "Values are NOT equal"
 fi 

String Comparisons

 =	equal
 !=	not equal
 <	less then
 >	greater then
 -n s1	string s1 is not empty
 -z s1	string s1 is empty

пример скрипта

 #!/bin/bash
 #Declare string S1
 S1="Bash"
 #Declare string S2
 S2="Bash"
 if [ $S1 = $S2 ]; then
 	echo "Both Strings are equal"
 else 
 	echo "Strings are NOT equal"
 fi 

Bash File Testing

 -b filename	Block special file
 -c filename	Special character file
 -d directoryname	Check for directory existence
 -e filename	Check for file existence
 -f filename	Check for regular file existence not a directory
 -G filename	Check if file exists and is owned by effective group ID.
 -g filename	true if file exists and is set-group-id.
 -k filename	Sticky bit
 -L filename	Symbolic link
 -O filename	True if file exists and is owned by the effective user id.
 -r filename	Check if file is a readable
 -S filename	Check if file is socket
 -s filename	Check if file is nonzero size
 -u filename	Check if file set-ser-id bit is set
 -w filename	Check if file is writable
 -x filename	Check if file is executable

гугл впоиске выдал на тему http://www.linuxconfig.org/Bash_scripting_Tutorial