sed comand

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Original Message

Name: fan
Date: March 25, 2005 at 23:58:21 Pacific
Subject: sed comand
OS: windows XP
CPU/Ram: 256MB

Comment:

Hi:
how to write a sed command to swap the first and second word in each line in a file?
Thanks

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Response Number 1

Name: nails
Date: March 27, 2005 at 00:22:14 Pacific
Subject: sed comand

Reply: (edit)

Hi:
sed is not a good command for dealing with words or fields. awk is better:
#!/bin/ksh
awk ' {
saveone=$1
$1=$2
$2=saveone
print
} ' myfile
It might be possible with sed, but it'll take a better programmer than I am to do it.
Regards,
Nails

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Response Number 2

Name: David Perry
Date: March 28, 2005 at 04:43:38 Pacific
Subject: sed comand

Reply: (edit)

echo "I have a red pencil box" | sed -e "s/$^[^ ]*$ $[^ ]*$/\2 \1/"

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Response Number 3

Name: nails
Date: March 28, 2005 at 08:33:55 Pacific
Subject: sed comand

Reply: (edit)

David:
Good solution! Unfortunately, it doesn't work on my solaris 7 box. Even the POSIX compliant version of sed doesn't work.
However, it DOES work on my Red Hat Linux 7.1 box. Must be a GNU sed upgrade.
Regards,
Nails

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