这个C Shell脚本怎么了？ [英] Whats wrong with this C shell script?

问题描述

我正在尝试为bash脚本在这里提到。

I am trying to write a C shell equivalent script for the bash script mentioned here.

这就是我所拥有的：

#! /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" [e-mail]
endif

这是错误我得到

$ ./scr
if: Badly formed number.
$

此页面提到 C壳中的数字必须是整数，所以我尝试了

This page mentions that "Numbers in the C-shell must be integers", so I tried

set now=`date +%Y%m%d%H%M`

但我仍然遇到相同的错误。

but I get the same error still.

推荐答案

我将您的脚本缩减为：

I cut down your script to this:

#! /bin/tcsh

if ( -n  "`find ./monme -newer ./cache`" ) then
    echo hello
endif

这给出了相同的错误。我认为罪魁祸首是

This gives the same error. I think the culprit is

-n  "`find ./monme -newer ./cache`"

-n 应该做什么？我认为它想要一个数字，但还有其他内容...

What is -n supposed to do? I think it wants a number, but gets something else...

更新：bash中的-n表示字符串长度不零。在我的tcsh版本中，就像这样使用==一样容易替换：

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" [e-mail]
endif

试一试，看看如果可行。

Try that and see if it works.

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