由于某种原因，@Thomas的解决方案对我不起作用，但我有更长的字符串和特殊字符和空格，所以我只是像这样更改参数:

if grep -Fxq 'string you want to find' "/path/to/file"; then
    echo "Found"
else
    echo "Not found"
fi

希望它能帮助到别人

一个无grep的解决方案，对我来说是有效的:

MY_LIST=$( cat /path/to/my_list.txt )



if [[ "${MY_LIST}" == *"${NEW_DIRECTORY_NAME}"* ]]; then
  echo "It's there!"
else
echo "its not there"
fi

基于: https://stackoverflow.com/a/229606/3306354

关于以下解决方案:

grep -Fxq "$FILENAME" my_list.txt

如果你想知道(像我一样)-Fxq在通俗英语中是什么意思:

F:影响PATTERN的解释方式(固定字符串而不是正则表达式) x:匹配整行 问:嘘……最小的印刷

从男子档案中可以看出:

-F, --fixed-strings
    Interpret  PATTERN  as  a  list of fixed strings, separated by newlines, any of which is to be matched.
    (-F is specified by POSIX.)
-x, --line-regexp
    Select only those matches that exactly match the whole line.  (-x is specified by POSIX.)
-q, --quiet, --silent
    Quiet; do not write anything to standard output.  Exit immediately with zero status  if  any  match  is
          found,  even  if  an error was detected.  Also see the -s or --no-messages option.  (-q is specified by
          POSIX.)

由于某种原因，@Thomas的解决方案对我不起作用，但我有更长的字符串和特殊字符和空格，所以我只是像这样更改参数:

if grep -Fxq 'string you want to find' "/path/to/file"; then
    echo "Found"
else
    echo "Not found"
fi

希望它能帮助到别人

更简单的方法:

if grep "$filename" my_list.txt > /dev/null
then
   ... found
else
   ... not found
fi

提示:如果你想要命令的退出状态，发送到/dev/null，而不是输出。

if grep -q "$Filename$" my_list.txt
   then
     echo "exist"
else 
     echo "not exist"
fi