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2000-08-17
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Short: Alternative to strip a given word from a string.
Author: agneta.nord@swipnet.se (Agneta Nord)
Uploader: agneta.nord@swipnet.se (Agneta Nord)
Version: 1.0 (7.12.99)
Type: util/cli
Name:
The name derivates from "Strip A Word".
Purpose:
I wrote this to simplify scripting while I was dealing with
logfiles. Usage is within scripts. 'saw' deals with arguments
only. I can see no relevance in interactive use.
If You don't do scripts, You probably don't find any use in
this "utility".
Template:
saw <word_number> <string>
'word_number' is a number from 1 and up to 999.
'string' is the literal string or a variable that contains
a number of words from which a particular word is searched.
Results:
The word is output to stdout and can be redirected to a file
or used to set a variable. A trailing newline is not appended
intentionally. I didn't want that as it can be used to extract
a word that is to be joined with other files where a newline
is not desired. If You need a newline You redirect the output
to a variable and use ECHO which append a newline character
for You.
If You point to a word beyond the list, a word_number that is
higher than the number of words, 'saw' exits with a warn and
give no output. See examples below for usage.
If word_number is not a numeric positive integer You'll have
a WARNing and not a FAIL.
Examples:
---------
The ENV:vehicles contains "car train boat bike":
# saw 3 $vehicles >vehicle
# more vehicle
boat
#
---------
The same contents in ENV:vehicles:
# saw 3 $vehicles
boat#
---------
Example, fictive logfile excerpt:
6.12.99 1:15:32 pppd: Local IP 123.234.3.56 recieved
If You want the IP adress for insertion in an html document,
in a script You could write something like:
set ipstring `search <logfile> "Local IP" nonum`
saw 6 $ipstring >ip ; from the example above -> 192.168.1.15
if warn ; something went wrong
quit ; so we bail out
endif
join head ip tail to myaddress.html
unset ipstring
---------
'saw' could also be used to test for a number of words in a string:
set fruit banana apple orange pineapple pear
saw 6 $fruit >nil:
if warn
echo "There is less than 6 fruits."
quit
endif
echo "There is 6 fruits or more."
---------
So what? I use "ECHO START=32 LEN=12 NOLINE".
Well, in some cases the length of some words are not static
and tests which could be tedious and error prone would have
to be performed by the script.