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语法:sh语法速查

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--- 语法:sh语法速查 [2024/09/03 10:26] – 创建 user01
+++ 语法:sh语法速查 [2024/09/03 10:27] (当前版本) – [1. 判断文件类型] user01
@@ 行 1: / 行 1: @@
 ====== sh语法速查 ======
+===== - 判断文件类型 =====
+<code bash>
+#!/bin/sh
+myPath="/var/log/httpd/"
+myFile="/var /log/httpd/access.log"
+# 这里的-x 参数判断$myPath是否存在并且是否具有可执行权限
+if [ ! -x "$myPath"]; then
+mkdir "$myPath"
+fi
+# 这里的-d 参数判断$myPath是否存在
+if [ ! -d "$myPath"]; then
+mkdir "$myPath"
+fi
+# 这里的-f参数判断$myFile是否存在
+if [ ! -f "$myFile" ]; then
+touch "$myFile"
+fi
+# 其他参数还有-n,-n是判断一个变量是否是否有值
+if [ ! -n "$myVar" ]; then
+echo "$myVar is empty"
+exit 0
+fi
+# 两个变量判断是否相等
+if [ "$var1" = "$var2" ]; then
+echo '$var1 eq $var2'
+else
+echo '$var1 not eq $var2'
+fi
+-f 和-e的区别
+Conditional Logic on Files
+-a file exists.
+-b file exists and is a block special file.
+-c file exists and is a character special file.
+-d file exists and is a directory.
+-e file exists (just the same as -a).
+-f file exists and is a regular file.
+-g file exists and has its setgid(2) bit set.
+-G file exists and has the same group ID as this process.
+-k file exists and has its sticky bit set.
+-L file exists and is a symbolic link.
+-n string length is not zero.
+-o Named option is set on.
+-O file exists and is owned by the user ID of this process.
+-p file exists and is a first in, first out (FIFO) special file or
+named pipe.
+-r file exists and is readable by the current process.
+-s file exists and has a size greater than zero.
+-S file exists and is a socket.
+-t file descriptor number fildes is open and associated with a
+terminal device.
+-u file exists and has its setuid(2) bit set.
+-w file exists and is writable by the current process.
+-x file exists and is executable by the current process.
+-z string length is zero.
+是用 -s 还是用 -f 这个区别是很大的！
+</code>

语法/sh语法速查.1725330361.txt.gz · 最后更改: 2024/09/03 10:26 由 user01