问题
I am trying to write a C shell equivalent script for the bash script mentioned here.
This is what I have :
#! /bin/tcsh
set now=`date +%Y%m%d%H%M.%S`
if (( ! -f "./cache" ) || (-n "`find ./monme -newer ./cache`" ))
then
touch cache -t "$now"
echo "new files added" | mail -s "new build" myemail@myserver.com
endif
and this is the error I get
$ ./scr
if: Badly formed number.
$
This page mentions that "Numbers in the C-shell must be integers", so I tried
set now=`date +%Y%m%d%H%M`
but I get the same error still.
回答1:
I cut down your script to this:
#! /bin/tcsh
if ( -n "`find ./monme -newer ./cache`" ) then
echo hello
endif
This gives the same error. I think the culprit is
-n "`find ./monme -newer ./cache`"
What is -n
supposed to do? I think it wants a number, but gets something else...
Update: -n in bash means "length of string is non-zero". In my version of tcsh it is as easy to replace as to use == "" like this:
if (( ! -f "./cache" ) || ("`find ./monme -newer ./cache`" != ""))
then
touch cache -t "$now"
echo "new files added" | mail -s "new build" myemail@myserver.com
endif
Try that and see if it works.
来源:https://stackoverflow.com/questions/3692137/whats-wrong-with-this-c-shell-script