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Full Discussion: Read Line is not Updated
Top Forums Shell Programming and Scripting Read Line is not Updated Post 302854667 by zzavilz on Wednesday 18th of September 2013 01:17:06 AM
Old 09-18-2013
Read Line is not Updated

Hi,

Is there a way to reflect the recent changes in the file being read when using "while read line" loop? Thanks!

script:
Code:
while read line
do
    echo $line
    cat x.dat|sed 's/2/6/g' > x.dat.temp
    mv x.dat.temp x.dat
done < x.dat

The results is still getting below, even though the 2 had been updated already to 6.
Code:
1
2
3
4
5

Thanks

Last edited by Scrutinizer; 09-18-2013 at 02:59 AM.. Reason: code tags
 

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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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