Very Computer

by **didd** » Fri, 13 May 2005 20:43:50

Hi - writing a ksh script to parse a datafile and alter various
characters to control characters (on a solaris 9 system if that makes a
difference).

For example, a line starting with a "1" needs to have the 1 replaced by
a linefeed i.e. Control L... no problems, I write my sed command

sed 's/^1/^L/' file > tmpfile

(where ^L is actually control L as typed in vi)

However, similarly "0" needs to be replaced by a linefeed - control J.

But of course I can't actually enter control J in vi (my editor of
choice) not even if I precede it with control V. All that happens is I
get a real line feed within the script which then (of course) does not
parse syntactically when I try and run it.

sed works fine this way oif done from the command line but thgis needs
to be scripted so it runs via cron...

How can I script this such that my zeroes in column one of a line in a
file gets replaced by a control J?

cheers!

ian

by **Icarus Sparr** » Fri, 13 May 2005 21:09:03

> However, similarly "0" needs to be replaced by a linefeed - control J.
> How can I script this such that my zeroes in column one of a line in a
> file gets replaced by a control J?

sed 's/^0/\
/' file > tmpfile

by **Bill Marcu** » Fri, 13 May 2005 23:45:07

On 12 May 2005 04:43:50 -0700, didds

> Hi - writing a ksh script to parse a datafile and alter various
> characters to control characters (on a solaris 9 system if that makes a
> difference).

> For example, a line starting with a "1" needs to have the 1 replaced by
> a linefeed i.e. Control L... no problems, I write my sed command

> sed 's/^1/^L/' file > tmpfile

> (where ^L is actually control L as typed in vi)

> However, similarly "0" needs to be replaced by a linefeed - control J.

> But of course I can't actually enter control J in vi (my editor of
> choice) not even if I precede it with control V. All that happens is I
> get a real line feed within the script which then (of course) does not
> parse syntactically when I try and run it.

> sed works fine this way oif done from the command line but thgis needs
> to be scripted so it runs via cron...

> How can I script this such that my zeroes in column one of a line in a
> file gets replaced by a control J?

sed 's/^0//' file | tr '' '\n' >newfile
should be a character that does not appear in the original file.

--
Test-tube babies shouldn't throw stones.

by **John W. Krah** » Sat, 14 May 2005 03:12:07

> Hi - writing a ksh script to parse a datafile and alter various
> characters to control characters (on a solaris 9 system if that makes a
> difference).

> For example, a line starting with a "1" needs to have the 1 replaced by
> a linefeed i.e. Control L... no problems, I write my sed command

> sed 's/^1/^L/' file > tmpfile

> (where ^L is actually control L as typed in vi)

> However, similarly "0" needs to be replaced by a linefeed - control J.

> But of course I can't actually enter control J in vi (my editor of
> choice) not even if I precede it with control V. All that happens is I
> get a real line feed within the script which then (of course) does not
> parse syntactically when I try and run it.

> sed works fine this way oif done from the command line but thgis needs
> to be scripted so it runs via cron...

> How can I script this such that my zeroes in column one of a line in a
> file gets replaced by a control J?

perl -pe's/^1/\f/;s/^0/\n/' file > tmpfile

John
--
use Perl;
program
fulfillment

by **didd** » Sat, 14 May 2005 17:04:50

Many thanks to all, and especially John - great solution mate!

ian

Very Computer

ksh scripted sed needs a control J - but I can't write the script!

ksh scripted sed needs a control J - but I can't write the script!

ksh scripted sed needs a control J - but I can't write the script!

ksh scripted sed needs a control J - but I can't write the script!

ksh scripted sed needs a control J - but I can't write the script!

ksh scripted sed needs a control J - but I can't write the script!