if file exists and regular file -r: Return true value, if file exists and is readable -w: Return true value, if file exists and is writable -x: Return true value, if file exists and is executable -d: Return true value, if exists and is a directory ...
# 判断文件是否存在,并有相关权限的属性 # 常规属性-rfileexists and is readable by the current process. #文件存在,并且本进程可读-wfileexists and is writable by the current process. #文件存在,并且本进程可写-xfileexists and is executable by the current process. #文件存在,并且本进程可执行 # 扩展...
-u file True if file exists and its set-user-id bit is set. -w file True if file exists and is writable. -x file True if file exists and is executable. -G file True if file exists and is owned by the effective group id. -L file True if file exists and is a symbolic link. ...
-x file True if file exists and is executable. -G file True if file exists and is owned by the effective group id. -L file True if file exists and is a symbolic link. -N file True if file exists and has been modified since it was last read. ...
$ if [ -x a.out ]; then echo "File is executable"; else echo "File is not executable"; fi File is executable So, thetest‘sxflag proves if the file exists and is executable. 3. Ruling out the Directories Now let’s notice that thetest‘sxcheck alone would suggestthat a folderfoo...
is readable-s FILE_NAM # TrueifFILE_NAM existsandisnotempty-w FILE_NAM # TrueifFILE_NAM has write permission-x FILE_NAM # TrueifFILE_NAM is executable#字符串测试操作-z STRING # TrueifSTRING is empty-n STRING # TrueifSTRING isnotemptySTRING1...
-x file exists and is executable by the current process. -z string length is zero. 字符测试:字符串比较 双目: >: 大于则为真 <: 小于则为真 >=:大于等于则为真 <=:小于等于则为真 ==:等于则为真 !=:不等于则为真 单目: -n String: 是否不空,不空则为真,空则为假 ...
The file is not writable on a read-only file system even if this test indicates true. -x file True if file exists and is executable. True indicates only that the execute flag is on. If file is a directory, true indicates that file can be searched. -z string True if the length of ...
bash will use whatever regex engine is installed on the user's system. Stick to POSIX regex features if aiming for compatibility.CAVEAT: This example only prints the first matching group. When using multiple capture groups some modification is needed....
FILEFILE exists and is a regular file-h FILEFILE exists and is a symbolic link (same as -L)-r FILEFILE exists and is readable-s FILEFILE exists and has a size greater than zero-w FILEFILE exists and is writable-x FILEFILE exists and is executable-z STRINGthe length of STRING is ...