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Top Forums Shell Programming and Scripting How to read file line by line and compare subset of 1st line with 2nd? Post 302926468 by RudiC on Monday 24th of November 2014 03:24:32 PM
Old 11-24-2014
Why don't you read the file, using "|" as the IFS character?
Code:
while IFS="|" read A B URL C
    do echo $URL
    done < file
<url1>
<url2>
<url3>
<url4>

In the loop, save URL to OLDURL, and compare e.g.
Code:
[ "$URL" != "$OLDURL" ] && echo different || echo equal

This User Gave Thanks to RudiC For This Post:
 

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line(1) 						      General Commands Manual							   line(1)

NAME
line - Reads one line from standard input SYNOPSIS
line STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: line: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPTIONS
None DESCRIPTION
The line command copies one line, up to and including a newline, from standard input and writes it to standard output. Use this command within a shell command file to read from your terminal. The line command always writes at least a newline character. NOTES
The line utility has no internationalization features and is marked LEGACY in XCU Issue 5. Use the read utility instead. EXIT STATUS
Success. End-of-File. EXAMPLES
To read a line from the keyboard and append it to a file, enter: echo 'Enter comments for the log:' echo ': c' line >>log This shell procedure displays the message: Enter comments for the log: It then reads a line of text from the keyboard and adds it to the end of the file log. The echo ': c' command displays a : (colon) prompt. See the echo command for information about the c escape sequence. SEE ALSO
Commands: echo(1), ksh(1), read(1), Bourne shell sh(1b), POSIX shell sh(1p) Functions: read(2) Standards: standards(5) line(1)
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