[英]How can I compare two strings in bash?
I am trying to remove all ".s" files in a folder that can be derived by ".c" source files. 我正在尝试删除可以由“ .c”源文件派生的文件夹中的所有“ .s”文件。 This is my code
这是我的代码
for cfile in *.c; do
#replace the last letter with s
cfile=${cfile/%c/s}
for sfile in *.s; do
#compare cfile with sfile; if exists delete sfile
if [ $cfile==$sfile ]; then
rm $sfile;
fi
done
done
But this code deletes all the ".s" files. 但是此代码将删除所有“ .s”文件。 I think it's not comparing the filenames properly.
我认为它没有正确比较文件名。 Can someone please help.
有人可以帮忙吗?
The canonical way to compare strings in bash is: 比较bash中字符串的规范方法是:
if [ "$string1" == "$string2" ]; then
this way if one of the strings is empty it'll still run. 这样,如果其中一个字符串为空,它将仍然运行。
You can use it like this: 您可以像这样使用它:
[[ "$cfile" = "$sfile" ]] && rm "$sfile"
OR 要么
[[ "$cfile" == "$sfile" ]] && rm "$sfile"
OR by using old /bin/[
(test) program 或通过使用旧的
/bin/[
(测试)程序
[ "$cfile" = "$sfile" ] && rm "$sfile"
Saying 话
if [ $chile==$sfile ]; then
would always be true since it amounts to saying 永远是真的,因为这等于说
if [ something ]; then
Always ensure spaces around the operators. 始终确保操作员周围有空间。
The other problem is that you're saying: 另一个问题是您在说:
cfile=${cfile/%c/s}
You probably wanted to say: 您可能想说:
sfile=${cfile/%c/s}
And you need to get rid of the inner loop: 而且您需要摆脱内循环:
for sfile in *.s; do
done
Just keep the comparison code. 只需保留比较代码即可。
I think the most simpliest solution would be: 我认为最简单的解决方案是:
for cfile in *.c ; do rm -f "${cfile%.c}.s" ; done
It just lists all the .c
files and try to delete the corresponding .s
file (if any). 它仅列出所有
.c
文件并尝试删除相应的.s
文件(如果有)。
for cFile in *.c; do
sFile="${cFile%c}s"
if [[ -f "$sFile" ]]; then
echo "delete $sFile"
fi
done
The actual deletion of the files I leave as an exercise. 我将实际删除文件作为练习。 :-)
:-)
You can also just brute force and delete everything and redirecting the error messages to /dev/null
: 您也可以蛮力删除所有内容,然后将错误消息重定向到
/dev/null
:
for cFile in *.c; do
sFile="${cFile%c}s"
rm "$sFile" &> /dev/null
done
but this will be slower of course. 但这当然会慢一些。
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