Answered Essay: Shell

Shell Scripting!

Part 1

Requirements

 The shell script “srchfile.sh” must accept exactly two arguments.

o The script shall first print the name of the file being searched.

o If there are one more instances of the string in the file, the script shall print

each line that contains the matching string, along with the line number of

the file. You may use the UNIX command “grep” in your script to do the

actual search. In fact, “grep” can even print the line number if used with

the appropriate option (see man page for grep).

 If the user enters more or less than the required number of arguments, the script

shall produce an error message and stop.

 The first argument shall represent the string to be searched.

 The second argument represents the name of the file to be searched. If the

second argument is not a file, the script shall produce an error message and

stop.

 The script must be able to execute on cs.franklin.edu

 The script file name must be: “srchfile.sh”.

 The script must be located in $HOME/itec400/homework

 Make sure the permissions on the your itec400 directory are 705

 Make sure the permissions on your script are 705

Sample Output

 Sunny Day scenario, searching for string “if” in file “ex0210” in “examples”

directory:

> srchfile.sh if /export/home/dandrear/public_html/itec400/examples/ex0210

—— File = /export/home/dandrear/public_html/itec400/examples/ex0210 ——

6:if [ “$LOGNAME” = “dandrear” ]

10:if [ “`ls | wc -l`” -ne 0 ]

14:if [ -w $PWD ]

 Rainy Day scenario, script is invoked with only one argument:

> srchfile.sh if

error: must provide 2 arguments.

usage: srchfile.sh search-pattern

file

 Rainy Day scenario, searching for “if” in a directory:

> srchfile.sh if /etc

error: second argument must be a file.

usage: srchfile.sh search-pattern file

Part 2

Requirements:

 The shell script “srch.sh” must accept exactly two arguments. The first

argument shall represent the string to be searched.

o The second argument represents either the name of the file to be searched

or a directory. If a directory is entered, then all files in the directory shall

be searched.

o The script “srch.sh” shall use the script “srchfile.sh” to search for the

string in a given file. If the second argument is a directory, then “srch.sh”

will invoke “srchfile.sh” repeatedly in a loop.

 If the user enters more or less than the required number of arguments, the script

shall produce an error message and stop.

 The script must be able to execute on cs.franklin.edu

 The script file name must be: srch.sh

 The script must be located in $HOME/itec400/homework

 Make sure the permissions on the your itec400 directory are 705

 Make sure the permissions on your script are 705

Sample Output

 Sunny Day scenario, searching for string “then” in file “ex0210” in “examples”

directory:

> srch.sh then

/export/home/dandrear/public_html/itec400/examples/ex0210

—— File = /export/home/dandrear/public_html/itec400/examples/ex0210 ——

7:then

11:then

15:then

 Sunny Day scenario, searching for string “then” in “examples” which is a

directory (search all files):

> srch.sh then /export/home/dandrear/public_html/itec400/examples

—— File = /export/home/dandrear/public_html/itec400/examples/ex0010 ——

—— File = /export/home/dandrear/public_html/itec400/examples/ex0020 ——

—— File = /export/home/dandrear/public_html/itec400/examples/ex0030 ——

—— File = /export/home/dandrear/public_html/itec400/examples/ex0040 ——

—— File = /export/home/dandrear/public_html/itec400/examples/ex0050 ——

—— File = /export/home/dandrear/public_html/itec400/examples/ex0205 ——

—— File = /export/home/dandrear/public_html/itec400/examples/ex0210 ——

7:then

11:then

15:then

.

.

.

 Rainy Day scenario, script is invoked with only one argument:

> srch.sh then

error: must provide 2 arguments.

usage: srchfile.sh search-pattern

file

Expert Answer

 

NOTE: I have completed the two scripts for your assignment and provided output screenshot of both scripts. Please check and let me know if you face any issues. I will revert back within 24 hours.

Part-1:

#!/bin/bash
#################
# File: srchfile.sh
# Author:
# Course: ITEC400
# Functionality: Search for a given string within a specified file name.
# Case #1: ./srchfile.sh <pattern> <file name>
##################
if [ $# -lt 2 ]
then
echo “error: must provide 2 arguments”
echo “usage: $0 search-pattern file”
elif [ $# -gt 2 ]
then
echo “error: must provide 2 arguments”
echo “usage: $0 search-pattern file”
elif [ -f $2 ]
then
echo “—— File = $PWD/$2 ——”
OUTPUT=`egrep -in $1 $2`
echo “$OUTPUT”
else
echo “error: second argument must be a file”
echo “usage: $0 search-pattern file”
fi

Part-2:

#!/bin/ksh
#################
# File: srch.sh
# Author:
# # Verify that two command line arguments have been provided.
# Case #1: ./srch.sh
# Case #2: ./srch.sh <.>
# Case #2 requires all files in the current directory to be searched
#################
original=$PWD
# Verify that two command line arguments are present
if [ $# -gt 2 ]
then
echo “error: must provide 2 arguments”
echo “usage: $0 search-pattern file”
elif [ $# -lt 2 ]
then echo “error: must provide 2 arguments”
echo “usage: $0 search-pattern file”
# Verify that the second command line argument is a file name
elif [ -f $2 ]
then
./srchfile.sh $1 $2
# Verify that the second command line argument is a directory
elif [ -d $2 ]
then
cd $2
listing=`ls -l | cut -c52-90`
for entry in $listing
do
if [ -x $entry ]
then
../srchfile.sh $1 $entry
fi
done
fi
cd $original

Script output:

 

 

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