SHELL SCRIPTING Programming, For Beginners, Learn Coding Fast! by Yao Ray

Author:Yao, Ray [Yao, Ray]
Language: eng
Format: epub
Publisher: Tutorial eBook & Book, A Quick Start Guide.
Published: 2020-08-03T16:00:00+00:00

-b file

If the object is a block device file, return true .

-c file

If the object is a character device file, return true .

Example 5.2

# Assume that the file “myFile . sh” does not exist, but we still check the property of this file .

#! /bin/bash

file="/root/myFile. sh"

if [ -r $file ] # check if the object is readable

then

echo "The object is readable"

else

echo "The object isn't readable"

fi

if [ -w $file ] # check if the object is writable

then

echo "The object is writable"

else

echo "The object isn't writable"

fi

if [ -x $file ] # check if the object is executable

then

echo "The object is executable"

else

echo "The object isn't executable"

fi

if [ -f $file ] # check if the object is a file

then

echo "The object is a file"

else

echo "The object isn't a file"

fi

if [ -d $file ] # check if the object is a directory

then

echo "The object is a directory"

else

echo "The object isn't a directory"

fi

if [ -s $file ] # check if the object isn’t empty

then

echo "The object isn't empty"

else

echo "The object is empty"

fi

if [ -e $file ] # check if the file is existing

then

echo "The file is existing"

else

echo "The file isn't existing"

fi

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