Question

^{In this assignment, you will demonstrate your ability to write simple shell scripts. This is a cumulative assignment that will challenge you to pull together a variety of lessons from throughout the course. 2 The Assignment Every now and then, I find myself with a large number of files that have inappropriate extensions (the set of characters in the file name after the last :') that need to be changed. For example, a complicated C++ program, developed by someone on a Windows machine where file names are not case sensitive, might have a number of files ending in “.CPP" and ".H". Not only are these inconsistent with the conventional “.cpp" and "h" endings, but they can pose a real issue with compiling the code. If the code contains statements like #include "Utilities.h" and the file name is "Utilities.H", the code will not compile on *nix systems, though it might on a Windows system. In this assignment you will be working towards a script that can be used to fix this and similar problems by giving a desired extension and then a group of files that we wish renamed to use that extension instead of whatever final extension they have at the moment, e.g. chExt.sh cpp *.CPP *.cpp chExt.sh h *.H}

Answer 1

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Code :

chExt1.sh:

#give path executable
#!/bin/bash                  
oldName=$2                   #take 2nd command line argument into oldName variable
newName=${oldName%.*}       #remove extension of filename
newName=$newName.$1           #append desired extension
mv "$oldName" "$newName"   #rename the file actually

Screenshot :

E#give path executable #! /bin/bash oldName=$2 newName=${oldName%. newName=$newName.$1 mv "$oldName" "$newName" 2 #take 2nd command line argument into oldName variable #remove extension of filename #append desired extension #rename the file actually 3 4 6.

Output :

UnixCourse/scriptAsst ] 12/30 21:25:49 CST 2019 [ 12/30 21:25:54 CST 2019 | UnixCourse/scriptAsst ] :$ echo ants > aardvark.CPP 12/30 21:26:19 CST 2019 [ /opt/cloverleaf/cis6.2/integrator/shubham/data /UnixCourse/scriptAsst ] *$ ls -lt total 8 5 Dec 30 21:26 aardvark.CPP -rw-rw-r-- 1 ho i hei |-rwxrwxr-x 1 hei hei 86 Dec 30 21:25 chExt1.sh 12/30 21:26:26 CST 2019 [ UnixCourse/scriptAsst ] $ ./chExtl.sh cpp aardvark.CPP --- --b. .-l. 1. - -- sd - UnixCourse/scriptAsst 12/30 21:27:15 CST 2019 [ :$ ls -lt ] total 8 5 Dec -rw-rw-r-- 1 hci hci |-rwxrwxr-x 1 hci hei 86 Dec 30 21:25 chExt1.sh 12/30 21:27:18 CST 2019 [ 21:26 aardvark.cpp UnixCourse/scriptAsst ] "$ date > bongo.dat UnixCourse/scriptAsst ] 12/30 21:27:38 CST 2019 | $ ls -lt total 12 |-rw-rw-r-- 1 hci hoci 29 Dec 30 21:27 bongo.dat 5 Dec 30 21:26 aardvark.cpp -rw-rw-r-- 1 hci hci |-rwxrwxr-x 1 hei hei 86 Dec 30 21:25 chExt1.sh 12/30 21:27:44 CST 2019 [ UnixCourse/scriptAsst ] $ ./chExtl1.sh backup bongo.dat UnixCourse/scriptAsst ] 12/30 21:28:09 CST 2019 [ 01S ls -lt total 12 |-rw-rw-r-- 1 hci hci 29 Dec 30 21:27 bongo.backup 5 Dec 30 21:26 aardvark.cpp -rw-rw-r-- 1 hci hci |-rwxrwxr-x 1 hci hei 86 Dec 30 21:25 chExt1.sh 12/30 21:28:11 CST 2019 [ /UnixCourse/scriptAsst ]

/UnixCourse/scriptAsst ] 12/31 00:00:41 CST 2019 [ L--n1 S ls -lt total 12 -rWxrWxr-x 1 hci hei 90 Dec 30 23:57 chExtl.sh O Dec 30 23:51 king cobra.dat -rw-rw-r-- 1 hci hci 29 Dec 30 21:27 bongo.backup 5 Dec 30 21:26 aardvark.cpp -rw-rw-r-- 1 hci hei -rw-rw-r-- 1 hci hci 12/31 00:00:44 CST 2019 [ hci@xrdclqintsin0lc$ ./chExtl.sh txt "king cobra.dat" 12/31 00:00:51 CST 2019 [ /UnixCourse/scriptAsst ] UnixCourse/scriptAsst ] :$ ls -lt total 12 -rwxrwxr-x 1 hci hci 90 Dec 30 23:57 chExtl.sh O Dec 30 23:51 king cobra.txt -rw-rw-r-- 1 hci hci -rw-rw-r-- 1 hci hci 29 Dec 30 21:27 bongo.backup 5 Dec 30 21:26 aardvark.cpp -rw-rw-r-- 1 hci hci 12/31 00:00:56 CST 2019 [ p UnixCourse/scriptAsst ]