AWK experts - how would I code around this in awk...
dkrr at telus.net
Sun Feb 21 19:48:47 UTC 2010
Alex Janssen wrote:
> Tony Arnold wrote:
>> You could replace the while loop with just a fold command, e.g.,
>> tr -d "\n\r" | fold -b -w $NEWLEN
>> I've not tested this, so I'd check man pages etc! I'm not sure if the -b
>> is required.
> fold? Didn't know about that one. Thanks, Tony.
> That works a lot better than "while read -n LINE".
> With the latter, If the last read is less than n characters, the
> while-loop quits before it executes the echo command and your output is
> short by the last read.
> The following script works.
> #remove all CR's and LF's and reinsert LF's every n characters
> if [ $# -lt 1 ]
> echo -e "\n$0\n Removes all CR's and LF's and reinsert LF's every n
> characters\n usage:\n $0 n\nn=new line length\n $0 reads from stdin
> and writes stdout"
> exit 0
> tr -d "\n\r"| fold -w $NEWLEN
> exit 0
> ********end script
> You really don't need to put it in a script file, except that it keeps
> you from having to remember how to put the 2 commands together.
> Just do:
> tr -d "\n\r" <oldfile | fold -w 20 >newfile
> I have bad memory, so I'll put things like this in script files.
> Maybe it is easier with awk, but now it works with bash. I'll have to
> test with Doug's awk script.
fold FOLD that is the command I have been trying to
remember. Sysadmin time was 30 years ago. I like this solution best!
tr -d "\n\r" <oldfile | fold -w 20 >newfile
My guess is that it will prove fastest esp. with a multi core cpu;
common these days.
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