linux - -x 和 -c 字符串比较选项有什么作用？

Question

当我遇到以下情况时，我正在移植另一个 shell 脚本：

if [[ ! -x $DVDREC ]]; then
  print "ERROR: $DVDREC not found. Exiting ..."
  exit 1
fi

if [[ ! -c ${DVDDEV} ]]; then
  print "ERROR: ${DVDDEV} not found. Exiting ..."
  exit 1
fi

我想知道 -c 和 -x 选项实际上对存储在 DVDREC 和 DVDDEV 中的字符串有什么作用？

Answer 1

从 bash shell 中的“帮助测试”：

  -c FILE        True if file is character special.
  -x FILE        True if the file is executable by you.

Answer 2

// 人工测试

   -c FILE
          FILE exists and is character special

   -x FILE
          FILE exists and execute (or search) permission is granted

Answer 3

引用man test：

   -c FILE
          FILE exists and is character special

   -x FILE
          FILE exists and execute (or search) permission is granted