The test command with -a, !, and -o operators? 1

[goldenradium2001]

Can anyone give me a good example of how these work?

 

[ecasadella]

test -a file
if [ $? -eq 0 ];then
echo "file exists"
fi



EDC

 

[ecasadella]

Sorry I misunderstood

It's

file1 exists

test file1
if [ $? -eq 0 ];then
echo "file1 exists"
fi

file1 exists an file2 doesn't

test file1 -o file2
if [ $? -eq 0 ];then
echo "one file at least exists"
fi


file1 exists an file2 doesn't

test ! file1 -o ! file2
if [ $? -eq 1 ];then
echo "one file at least doesn't exist"
fi


! negation operator
-a binary and operator
-o binary or operator

EDC

 

[parbhani]

In case of ksh , visit

http://www.firstalt.co.uk/service/sa/korn_shell/ksh_memo.txt

This will explain most of the operators and possibilities
Enjoy .........