Linux Script to read a file line by line

Ravi_Mangaluru · 12-30-2021, 01:54 AM

Dear Forum Users

Season's Greetings for Ravi_Mangaluru hailing fro Mangaluru, Karnataka, India.

I need a help from you on a shell Script for the following question
I have a file called states with names of 10 states like a,b,c,d,e,f,g, etc;
My aim is to read the file states line by line and produce the output as

A beautiful State a
A beautiful State b
A beautiful State c
A beautiful State d
A beautiful State e and so on for all states in the file.

This is how my script looks
While !EOF do
echo " A beautiful Cat $state"
done

But I am not getting the desired output

Please note: This script has to be done without using BASH. It has to be written using the sh

Can someone help me in this?

Thank you.

Turbocapitalist · 12-30-2021, 02:19 AM

Welcome.

Please edit the above post to use [code] [/code] tags around your script so that it is easier to read. Then try running it through shellcheck to proof read it for errors.

It looks like you aim to use a while loop to read line by line, so it would help to review the syntax for that.

Then give it a try again and report back on the changes. Presumably it will work, since it looks close already. If not, report on the progress and we can provide feedback.

shruggy · 12-30-2021, 04:04 AM

You don't have to write a script for this. A sed one-liner would be enough. See example 25. Insert five blank spaces at the beginning of each line in Sed One-Liners Explained.

boughtonp · 12-30-2021, 06:11 AM

https://mywiki.wooledge.org/BashFAQ/001

teckk · 12-30-2021, 07:18 AM

Code:

while read line; do echo "$line"; sleep 1; done < file.txt

cat file.txt | while read x; do echo "$x"; sleep 1; done

ondoho · 12-31-2021, 05:57 AM

"A beautiful Cat"

TB0ne · 12-31-2021, 10:22 AM

Quote:

Originally Posted by Ravi_Mangaluru

Dear Forum Users
Season's Greetings for Ravi_Mangaluru hailing fro Mangaluru, Karnataka, India.

I need a help from you on a shell Script for the following question I have a file called states with names of 10 states like a,b,c,d,e,f,g, etc; My aim is to read the file states line by line and produce the output as

Code:

A beautiful State a
A beautiful State b
A beautiful State c
A beautiful State d
A beautiful State e and so on for all states in the file.

This is how my script looks

Code:

        While !EOF do
            echo " A beautiful Cat $state"
        done

But I am not getting the desired output Please note: This script has to be done without using BASH. It has to be written using the sh Can someone help me in this?

Why don't you tell us what you ARE getting when you run your script, and how you're running it. There is a site call shellcheck.net that will point out some flaws in your script, but this sounds very much like a verbatim-homework question. And using capital letters for While and Cat won't get you far.

murugesan · 01-05-2022, 10:46 PM

@Ravi_Mangaluru

You can try the following

Code:

$ cat ./4175705567.sh
#!/bin/sh
/usr/bin/awk -F',' '{
 for(col=1;col<NF;col++)
        printf( "A beautiful State %s\n", $col);
 printf( "A beautiful State %s\n", $1);
}' 4175705567.txt
$ chmod +x ./4175705567.sh
$ ./4175705567.sh
A beautiful State a
A beautiful State b
A beautiful State c
A beautiful State d
A beautiful State e
A beautiful State f
A beautiful State g
A beautiful State a
$ /usr/bin/awk -F',' '{
 for(col=1;col<NF;col++)
        printf( "A beautiful State %s\n", $col);
 printf( "A beautiful State %s\n", $1);
}' ./4175705567.txt
A beautiful State a
A beautiful State b
A beautiful State c
A beautiful State d
A beautiful State e
A beautiful State f
A beautiful State g
A beautiful State a
$ #Updated script. Character "a" was repeated in your input file. Handled that duplicate errors.
$ cat ./4175705567.sh
#!/bin/sh
if [ -f ./4175705567.txt ]
then
 /usr/bin/awk -F',' '{
        for(indx=1;indx<=NF;indx++)
        {
                if ( "" != $indx )
                {
                        BeautifulState[$indx] = $indx;
                }
        }
 }
 END {
        for(DispVal in BeautifulState)
        {
                printf( "A beautifule State %s\n", DispVal);
        }
 }' ./4175705567.txt
else
 echo ls ./4175705567.txt
 ls ./4175705567.txt
fi
$ ./4175705567.sh
A beautifule State a
A beautifule State b
A beautifule State c
A beautifule State d
A beautifule State e
A beautifule State f
A beautifule State g
$ awk -F',' '{
        for(indx=1;indx<=NF;indx++)
        {
                if ( "" != $indx )
                {
                        BeautifulState[$indx] = $indx;
                }
        }
 }
 END {
        for(DispVal in BeautifulState)
        {
                printf( "A beautifule State %s\n", DispVal);
        }
 }' ./4175705567.txt
A beautifule State a
A beautifule State b
A beautifule State c
A beautifule State d
A beautifule State e
A beautifule State f
A beautifule State g
$