SCRIPT 1 ASSIGNMENT Write a script faddexec.sh that takes a filename as an argum

Question

SCRIPT 1 ASSIGNMENT Write a script faddexec.sh that takes a filename as an argument and adds execution permission to the file for the user if the file is a regular file. Make sure that your script checks for error conditions. Use the following pseudocode to develop your script:

#!/bin/bash if # of
arguments is one then
   if file in $1 exists  
then
       if file in $1 is a regular file
then
       add execute permission    
else
       print message that this is not a regular file   
fi    else
      print message that the file does not exist  
fi else
   print the "Usage" message
fi

Explanation / Answer

Code:
#!/bin/bash

##########################################################################################
# Script to add execution permission to the file for the user if the file is a regular file
##########################################################################################

# Checking if user has passed the filename as an argument
if [ $# -ne 1 ]
then
   echo "Must pass filename as an argument. Usage: $0 <filename>"
   exit
fi

# Assiging the file passed in commandline to variable filename
filename=$1

# Checking if filename exists
if [ -e $filename ]
then
   # checking if file is a regular file
   if [ -f $filename ]
   then
       # adding execute permission to the regular file
       chmod +x $filename
       echo "File $filename has execute permission added"
   else
       # printing message not regular file as file is not a regular file
       echo "File $filename is not a regular file"
   fi
else
   # printing message when filename does not exist
   echo "File $filename does not exist"
   echo "Usage: $0 <filename>"
fi

NOTE: Give execute permission (chmod +x faddexec.sh) to the file "faddexec.sh" once you saved the code in your system

Execution and output:

186590cb0725:Shell bonkv$ ./faddexec.sh
Must pass filename as an argument. Usage: ./faddexec.sh <filename>

186590cb0725:Shell bonkv$ ./faddexec.sh 1
File 1 does not exist
Usage: ./faddexec.sh <filename>

186590cb0725:Shell bonkv$ ./faddexec.sh 2
File 2 does not exist
Usage: ./faddexec.sh <filename>

186590cb0725:Shell bonkv$ ./faddexec.sh 1 2
Must pass filename as an argument. Usage: ./faddexec.sh <filename>

186590cb0725:Shell bonkv$ ls -ld test
drwxr-xr-x 2 bonkv 1896053708 68 May 12 13:27 test
186590cb0725:Shell bonkv$ ./faddexec.sh test
File test is not a regular file

186590cb0725:Shell bonkv$ ls -tlrh groups
-rw-r--r-- 1 bonkv 1896053708 125B Apr 29 07:51 groups
186590cb0725:Shell bonkv$ ./faddexec.sh groups
File groups has execute permission added
186590cb0725:Shell bonkv$ ls -tlrh groups
-rwxr-xr-x 1 bonkv 1896053708 125B Apr 29 07:51 groups
186590cb0725:Shell bonkv$

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