Shell Programming and Scripting

hi

i have following sed command


this replaces "** in filename1 with octal value 007 filename2

when i put it in script it wont work but it works from command line

my OS is sun OS

---------- Post updated at 06:38 PM ---------- Previous update was at 06:14 PM ----------

i think i use bash shell so it wont work

what should i change to make it work in bash

---------- Post updated at 06:39 PM ---------- Previous update was at 06:38 PM ----------

i think i use bash shell so it wont work

what should i change to make it work in bash

I'm guessing that bash's built-in echo command isn't treating \007 the way you'd like. I personally find that echo varies so widely between systems/shells that I avoid using it at all possible costs. I also do not advocate breaking a sed string to "insert" shell generated text -- hard to maintain in my humble opnion.

If I were doing it, I'd tackle it this way as it should work regardless of shell:

Code:

awk 'BEGIN { r=sprintf( "%c", 7 ); } {gsub( "\"\\*\\*", r ); print}' filename >filename2

This replaces the "** with the bell character (7) and then prints the record.

Also, I'm sure someone will chime in that your use of cat is unnecessary as sed can read the input file directly, so I'll point it out:

Code:

sed 's/this/that/g' filename >filename2

No need to cat the file and pipe to sed -- not efficient.

the above statment doesn't work

it creates a zero byte file



it a little bit urgent

can someone help

What O/S are you using? If you are on Sun OS you should use nawk rather than awk.

Ive tested this both on a SUSE Linux and FreeBSD system and it works as expected; sorry it's not working for you.

i use sun os

so should i replace awk with nawk?

Yes -- I hope that will do the trick. I don't use Sun any more, so I cannot test there, but I remember awk on the Sun as being very limited.

it didn't work