test - check file types and compare values

To print “Yes, that’s true.” when 100 is greater than 99.

$ test 100 -gt 99 && echo "Yes, that's true." || echo "No, that's false."

To print "No, that's false." when 99 is greater than 100.

$ test 99 -gt 100 && echo "Yes, that's true." || echo "No, that's false."

To check if a file exists and is a regular file

$ test -f /etc/resolv.conf && echo "File /etc/resolv.conf found." || echo "File /etc/resolv.conf not found."
$ test -f /etc/ssh/sshd_config && echo "File /etc/ssh found." || echo "File /etc/ssh not found."

To print 0 when the expression is true and two strings are identical.

$ [ "awesome" = "awesome" ]; echo $?

To print 1 when the expression is false and two strings are not identical.

$ [ "awesome" = "1awesome" ]; echo $?

To print "1" because the expression is false

$ [ 7 -eq 10 ]; echo $?

To print "0" because the expression is true

$ [ 10 -eq 10 ]; echo $?

regards,

T.Dhanasekar