当在bash中命令时，如果file.txt中有$字符串...做...“ [英] While command in bash "if there's a $string in file.txt... do..."

问题描述

需要帮助while命令。如果在playlist.txt中有$ sitename，我想要运行命令

这是我的bash：

  cat playlist.txt | grep -e$ sitename| sed -es /^.* \（http：。*$ sitename。* flv\）。* $ / \1 / g|排序| uniq> checklist.txt 
 cat checklist.txt 
 
 while [While can find $ sitename in checklist.txt];做
 qa 
 done 
  

这是我已经尝试过的

  while [-n$ echopl]; do 
 qa 
 done 
 
 while ['grep -q $ string checklist.txt> / dev / null']; do 
 qa 
 done 
 
 while [grep -q$ stringchecklist.txt]; do 
 qa2 
 done 
 while grep -q$ stringchecklist.txt;做
 qa 
 done 
 
而grep -q'$ string'checklist.txt; do 
 qa 
 done 
 
 
如果grep -q$ stringchecklist.txt;那么
 qa 
 fi 
  

暂时我把很多if命令：（

ifmorelinks
ifmorelinks
ifmorelinks
ifmorelinks
ifmorelinks

解决方案

 如果grep$ stringchecklist.txt> / dev / null 2& 1;然后
 qa 
 fi 
  

Need help with the while command. I want to run a command if there's a $sitename in playlist.txt

Here's my bash:

   cat playlist.txt | grep -e "$sitename" |  sed -e "s/^.*\(http:.*"$sitename".*flv\).*$/\1/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

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 :(

ifmorelinks ifmorelinks ifmorelinks ifmorelinks ifmorelinks

解决方案

if grep "$string" checklist.txt >/dev/null 2>&1 ; then
  qa
fi

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