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Full Discussion: replacing first line or lines in a file
Top Forums UNIX for Advanced & Expert Users replacing first line or lines in a file Post 302078204 by Terrible on Wednesday 28th of June 2006 08:23:58 PM
Old 06-28-2006
Quote:
Originally Posted by x96riley3
Since the source file and destination file are the same, consider doing something like this.

Input file called inputfile.txt contains just the word 'This'

commandline
perl -pi -w -e 's/This/I did it/g;' inputfile.txt
#This replaces the word This with I did it all from the commandline

inside script called myscript.pl
perl -pi -w -e 's/This/I did it/g;' $1
#Put this perl line inside a script and run it. Passing your input file to the script

Run script from commandline.

#myscript.pl inputfile.txt

-X


thanks for your suggestions. what i ended up doing was just reconstructing the file using a synchronized copy of the original. what i was trying to edit couldn't be done with sed or awk. i tried but it just couldn't be done. so i just used a combination of echo, awk, tee and a variety of other commands to draw out out the wanted line and then appended the rest of the file content to the end of that file
Terrible
 

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LEARN ABOUT OSF1

forward

forward(4)						     Kernel Interfaces Manual							forward(4)

NAME

       forward - forward mail

SYNOPSIS

       /var/adm/forward/username $HOME/.forward

DESCRIPTION

       The .forward file allows a user to forward messages to another host, or to invoke programs (such as vacation(1)) to process their mail.	It
       is formatted as a series of comma-separated addresses in the form: addr_1, addr_2, ...  Alternatively, each address can be  on  a  separate
       line.

       The newer sendmail.v8 program also allows the use of comments (lines that begin with a ``#'') and blank lines.

       As  with the aliases(4) file, mail messages can be forwarded to another host or given to programs for further processing.  The following is
       an example of the vacation program. Assuming that the user's name is myra, create a .forward  file  and	add  the  following  line:  myra,
       "|/usr/bin/vacation myra"

       The  previous  example  forwards mail to myra (the backslash prevents an accidental aliasing loop), and also sends a copy of the message to
       the vacation program.

       For security reasons, the file must be owned by the user or by root and it should be writable only by the file  owner.	In  addition,  the
       file must be readable by the owner (myra) or root.

       On  traditional	systems,  only	the  $HOME/.forward file is checked.  The sendmail.v8 program allows the use of the system-wide forwarding
       directory /var/adm/forward.  By default, this directory is checked for a forward file prior to examining the users $HOME directory.

FILES

       System-wide forwarding file.  The per-user forwarding file.

RESTRICTIONS

       The sendmail command can hang trying to read the user's $HOME/.forward file.  If the user's home directory is NFS-mounted  and  temporarily
       unavailable, sendmail will stall until the directory becomes available again.  The use of non-NFS mounted directories for the forwarding of
       files is recommended.

       The use of /var/adm/forward is supported only by sendmail.v8.

       The actual path for /var/adm/forward is configurable in the sendmail.cf file.

       Incorrect file permissions/ownership are quietly ignored.

       It is easy to create an accidental loop, for example, on host_a myra@host_b and on host_b myra@host_a

RELATED INFORMATION

       Commands:  aliases(4), sendmail.cf(4), sendmail(8) delim off

																	forward(4)
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