虽然 bash 中的命令“如果 file.txt 中有 $string... 做...”
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While command in bash "if there's a $string in file.txt... do..."
提问by Crazy_Bash
Need help with the while command. I want to run a command if there's a $sitename in playlist.txt
需要有关 while 命令的帮助。如果 playlist.txt 中有 $sitename，我想运行一个命令
Here's my bash:
这是我的 bash：
cat playlist.txt | grep -e "$sitename" | sed -e "s/^.*\(http:.*"$sitename".*flv\).*$//g" | sort | uniq > checklist.txt
cat checklist.txt
while [ " While can find $sitename in checklist.txt" ]; do
qa
done
that's what i have tried already
这就是我已经尝试过的
while [ -n "$echopl" ]; do
qa
done
while [ 'grep -q $string checklist.txt >/dev/null' ]; do
qa
done
while [ "grep -q "$string" checklist.txt" ]; do
qa2
done
while grep -q "$string" checklist.txt; do
qa
done
while grep -q '$string' checklist.txt; do
qa
done
if grep -q "$string" checklist.txt ; then
qa
fi
Temporarily I put many if commands :(
暂时我放了很多 if 命令:(
ifmorelinks ifmorelinks ifmorelinks ifmorelinks ifmorelinks
ifmorelinks ifmorelinks ifmorelinks ifmorelinks ifmorelinks
采纳答案by Andrew Schulman
if grep "$string" checklist.txt >/dev/null 2>&1 ; then
qa
fi
回答by unbeli
while grep -q "$string" checklist.txt; do
qa
done
If $stringmeans literally $stringand not the value of stringvariable, use this:
如果$string是字面意思$string而不是string变量的值，请使用：
while grep -q '$string' checklist.txt; do
qa
done
