實(shí)現(xiàn)代碼一、
#!/bin/sh # 判斷文件是否存在 # link:www.jb51.net # date:2013/2/28 myPath="/var/log/httpd/" myFile="/var /log/httpd/access.log" # 這里的-x 參數(shù)判斷$myPath是否存在并且是否具有可執(zhí)行權(quán)限 if [ ! -x "$myPath"]; then mkdir "$myPath" fi # 這里的-d 參數(shù)判斷$myPath是否存在 if [ ! -d "$myPath"]; then mkdir "$myPath" fi # 這里的-f參數(shù)判斷$myFile是否存在 if [ ! -f "$myFile" ]; then touch "$myFile" fi # 其他參數(shù)還有-n,-n是判斷一個(gè)變量是否是否有值 if [ ! -n "$myVar" ]; then echo "$myVar is empty" exit 0 fi # 兩個(gè)變量判斷是否相等 if [ "$var1" = "$var2" ]; then echo '$var1 eq $var2' else echo '$var1 not eq $var2' fi
實(shí)現(xiàn)代碼二、
#shell判斷文件夾是否存在 #如果文件夾不存在,創(chuàng)建文件夾 if [ ! -d "/myfolder" ]; then mkdir /myfolder fi #shell判斷文件,目錄是否存在或者具有權(quán)限 folder="/var/www/" file="/var/www/log" # -x 參數(shù)判斷 $folder 是否存在并且是否具有可執(zhí)行權(quán)限 if [ ! -x "$folder"]; then mkdir "$folder" fi # -d 參數(shù)判斷 $folder 是否存在 if [ ! -d "$folder"]; then mkdir "$folder" fi # -f 參數(shù)判斷 $file 是否存在 if [ ! -f "$file" ]; then touch "$file" fi # -n 判斷一個(gè)變量是否有值 if [ ! -n "$var" ]; then echo "$var is empty" exit 0 fi # 判斷兩個(gè)變量是否相等 if [ "$var1" = "$var2" ]; then echo '$var1 eq $var2' else echo '$var1 not eq $var2' fi
-f 和-e的區(qū)別
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 還是用 -f 這個(gè)區(qū)別是很大的!
標(biāo)簽:淘寶邀評(píng) 邵陽(yáng) 馬鞍山 許昌 婁底 金昌 巴彥淖爾 赤峰
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