vern@2007-03-03:/var% ls tags
shell
sh脚本中if条件
| 文件 |
含义 |
| -r |
True if file exists and is readable |
| -w |
True if file exists and is writable |
| -x |
True if file exists and is executable |
| -f |
True if file exists and is a regular file |
| -d |
True if file exists and is a directory |
| -c |
True if file exists and is a character special file |
| -b |
True if file exists and is a block special file |
| -p |
True if file exists and is a named pipe (FIFO) |
| -u |
True if file exists and is a SETUID file |
| -g |
True if file exists and is a SETGID file |
| -k |
True if file exists and the sticky bit is set |
| -s |
True if file exists and has a size greater than zero |
| 逻辑 |
含义 |
| ! |
Not |
| -a |
And |
| -o |
Or (has lower precedence that -a) |
| ( ) |
Parentheses for grouping| |
| 数值 |
含义 |
| -ne |
Not equal |
| -eq |
Equal |
| -gt |
Greater then |
| -ge |
Greater than or equal |
| -le |
Less than or equal |
| -lt |
Less than| |
| 其他 |
含义 |
| -z str |
True if string length is zero |
| -n str |
True if string length is non-zero |
| str1 = str2 |
True if strings are identical. Note that this uses a single = symbol unlike C’s equality operator. |
| str1 != str2 |
True if strings are not identical |
| str |
True if string is not the null string |
