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Top Forums UNIX for Dummies Questions & Answers String substitutions in ASCII files - Post 23965 by SanjivNagraj on Wednesday 3rd of July 2002 04:08:46 AM
Old 07-03-2002
MySQL String substitutions in ASCII files -

We need to scramble data in a number of ASCII files. Some of these files are extremely large (1.2 GB). By scrambling, I mean that we need to substitute certain strings, which number around 400, with scrambled strings. An example has been given below

If "London" occurs in the file, then it needs to be substituted by "X1"

If "Frankfurt" occurs in the file, then it needs to be substituted by "X2".

We have written a Korn shell script, but there are huge performance problems as we need to check for 400 different strings. What is the best way of doing this ?.

The machine is HP-UX B.11.00 E 9000/800.

The solution suggested by Perderabo works...................
...............like LIGHTNING.

Thanks a lot for the help.


Last edited by SanjivNagraj; 07-04-2002 at 07:52 AM..
 

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machid(1)						      General Commands Manual							 machid(1)

NAME
machid: hp9000s200, hp9000s300, hp9000s400, hp9000s500, hp9000s700, hp9000s800, hp-mc680x0, hp-pa, pdp11, u370, u3b, u3b10, u3b2, u3b5, vax - provide truth value about processor type SYNOPSIS
DESCRIPTION
The following commands return a true value (exit code 0) if the a processor type matches the command name. Otherwise a false value (exit code nonzero) is returned. These commands are commonly used within makefiles and shell procedures to improve portability of applications (see make(1)). +-----------+-------------------------++--------+--------------------------+ |Command | True for ||Command | True for | +-----------+-------------------------++--------+--------------------------+ |hp9000s200 | Series 200 ||pdp11 | PDP-11/45 or PDP-11/70 | |hp9000s300 | Series 300 ||u3b | 3B20 computer | |hp9000s400 | Series 400 ||u3b2 | 3B2 computer | |hp9000s500 | Series 500 ||u3b5 | 3B5 computer | |hp9000s700 | Series 700 ||u3b10 | 3B10 computer | |hp9000s800 | Series 800 or 700 ||u370 | IBM System/370 computer | |hp-mc680x0 | Series 200, 300, or 400 ||vax | VAX-11/750 or VAX-11/780 | |hp-pa | Series 700 or 800 || | | +-----------+-------------------------++--------+--------------------------+ EXAMPLES
Given a shell script that must behave differently when run on an HP 9000 Series 700 or 800 system, select the correct code segment to be executed: WARNINGS
always returns true on both Series 800 and Series 700 systems. Therefore, when using this command in scripts to determine hardware type, always use both and in the appropriate sequence to ensure correct results (see machid(1) will no longer provide support for future machines beyond the Series 800 and Series 700 systems. Decisions should be based on the hardware and software configuration information returned by getconf(1). SEE ALSO
getconf(1), make(1), sh(1), test(1), true(1). machid(1)
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