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  • Converting LF to CRLF in IFS Files

    October 17, 2007 Hey, Ted

    I had a situation where I wanted to change the end-of-line character from linefeed to carriage-return/linefeed to make a JavaScript file on the Integrated File System more readable in Notepad. I stumbled upon EDIT FILE (EDTF), F15, option 5. Then, after a little searching, I found your articles. Talk about reinventing the wheel! I was surprised that changing end-of-line characters was not part of the CHANGE ATTRIBUTE (CHGATR) command (or some other command). Is there any chance you could share a Qshell solution that converts LF to CRLF? I love using Qshell when I can, but sometimes it really stumps me.

    –Bruce

    Your best bet might be the CL-command route. The following sequence of commands converts file test-lf to test-crlf.

    CRTPF QTEMP/SAVE RCDLEN(256)
    
    CPYFRMSTMF FROMSTMF('test-lf')
    TOMBR('/QSYS.LIB/QTEMP.LIB/SAVE.FILE/SAVE.MBR')
    mbropt(*replace) CPYTOSTMF FROMMBR('/QSYS.LIB/QTEMP.LIB/SAVE.FILE/SAVE.MBR')
    TOSTMF('test-crlf') STMFCODPAG(*PCASCII) ENDLINFMT(*CRLF)

    I looked for a Qshell solution and this is the only thing I could come up with.

    touch -C 1252 test-crlf
    while read line; do echo "$liner"; done test-crlf
    

    The touch utility creates a file with CCSID 1252, which is the same format you get when you specify CPYTOSTMF … STMFCODPAG(*PCASCII). The while loop reads from standard input and writes to standard output. The echo command inside the while loop reads a line of the IFS file into a variable called line, then writes the line variable and carriage return to standard output.

    I used the od utility to verify that each line of test-crlf was terminated with x’0D0A’.

    od -tx test-crlf
    

    Then I FTP’d both test-lf and test-crlf to my PC using a binary transfer. Notepad properly opened test-crlf, but not test-lf. However, there is one “feature” of this approach that may or may not be a problem: this method drops leading spaces from each line.

    I talked to another Guru author, Bruce Guetzkow, who Googled and found the following sed command at a Web site called nixCraft.

    sed 's/$'"/`echo r`/" test-lf >test-crlf
    

    I tested this method, and it worked for me.

    By the way, Google also tells me that many shops use a unix2dos utility. If it’s been ported to the System i, I’m not aware of it.

    –Ted

    RELATED STORIES

    EDTF and End-of-Line Delimiters

    EDTF and End-of-Line Delimiters, Take Two

    Stream Files and End-of-Line Delimiters, Take Three



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Volume 7, Number 36 -- October 17, 2007
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Table of Contents

  • Controlling System i Shutdown Activities Using An Intelligent Power-Handling Program, Part II
  • Converting LF to CRLF in IFS Files
  • Reader Feedback: More on Vendor Names and Changing System Names

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