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Top Forums Shell Programming and Scripting Reading line1 with line2 and line 2 with line 3 in unix Post 302582698 by chethanbg2010 on Saturday 17th of December 2011 05:18:10 AM
Old 12-17-2011
Reading line1 with line2 and line 2 with line 3 in unix

Hi,

I have a requirement where i have to read a file line by line and see if the string(fixed postion 10 to 15 in the file) in line 2 is greater than string in line 1.
I have used following code

Code:
while read LINE1 
       do
       current_inv_no=$(echo "$LINE1" | cut -c 10-15)
       read LINE2 
       next_inv_no=$(echo "$LINE2" | cut -c 10-15)
//i will compare the nos here
       done <$file

The problem with the above code is line1 is compared with line 2 and line 3 is compared with line 4.
But my requirement is i want to compare line 1 with line 2 and line 2 with line 3 and so on

can some one help me on this.

Thanks!

Last edited by zxmaus; 12-17-2011 at 02:01 PM..
 

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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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