shell腳本判斷文件是否存在

這篇文章主要介紹“shell腳本判斷文件是否存在”，在日常操作中，相信很多人在shell腳本判斷文件是否存在問題上存在疑惑，小編查閱了各式資料，整理出簡單好用的操作方法，希望對大家解答”shell腳本判斷文件是否存在”的疑惑有所幫助！接下來，請跟著小編一起來學習吧！

實現代碼一、

#!/bin/sh
# 判斷文件是否存在
# link：www.neiyidaogou.com
# date：2013/2/28

myPath="/var/log/httpd/"
myFile="/var /log/httpd/access.log"

# 這里的-x 參數判斷$myPath是否存在并且是否具有可執行權限
if [ ! -x "$myPath"]; then
 mkdir "$myPath"
fi
# 這里的-d 參數判斷$myPath是否存在
if [ ! -d "$myPath"]; then
 mkdir "$myPath"
fi

# 這里的-f參數判斷$myFile是否存在
if [ ! -f "$myFile" ]; then
 touch "$myFile"
fi
# 其他參數還有-n,-n是判斷一個變量是否是否有值
if [ ! -n "$myVar" ]; then
 echo "$myVar is empty"
 exit 0
fi

# 兩個變量判斷是否相等
if [ "$var1" = "$var2" ]; then
 echo '$var1 eq $var2'
else
 echo '$var1 not eq $var2'
fi

實現代碼二、

#shell判斷文件夾是否存在

#如果文件夾不存在，創建文件夾
if [ ! -d "/myfolder" ]; then
 mkdir /myfolder
fi

#shell判斷文件,目錄是否存在或者具有權限

folder="/var/www/"
file="/var/www/log"

# -x 參數判斷 $folder 是否存在并且是否具有可執行權限
if [ ! -x "$folder"]; then
 mkdir "$folder"
fi

# -d 參數判斷 $folder 是否存在
if [ ! -d "$folder"]; then
 mkdir "$folder"
fi

# -f 參數判斷 $file 是否存在
if [ ! -f "$file" ]; then
 touch "$file"
fi

# -n 判斷一個變量是否有值
if [ ! -n "$var" ]; then
 echo "$var is empty"
 exit 0
fi

# 判斷兩個變量是否相等
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 這個區別是很大的！

到此，關于“shell腳本判斷文件是否存在”的學習就結束了，希望能夠解決大家的疑惑。理論與實踐的搭配能更好的幫助大家學習，快去試試吧！若想繼續學習更多相關知識，請繼續關注億速云網站，小編會繼續努力為大家帶來更多實用的文章！