04-02-2009
Hi,
Ok, what I have is an installation script for an application. If this script detects an existing installation of the application it attempts an upgrade. This involves:
1. backing up the existing installation directory.
2. installing a fresh installation.
3. extracting specific lines from a configuration file in the backuped directory and inserting them, at a specific point, in the freshly installed config file.
So, I need to search for the line or lines in the old config file. This may return several lines of config. These lines must then be inserted in the new config file at a specific text marker, such as something like:
#@@Merge_config_here@@#
so, in my script I need to hold the extracted text in a variable and insert it in the new config file. The marker text also needs to be removed, so actually it is a replace.
Now, from what I've read, sed does not allow literal newline characters in a replacement pattern. If they exist then they must be escaped with a backslash. This is why I want to add a backslash to the end of each line I extract from the old config file.
However, whatever I'm doing, sed still doesn't like what it is getting.
I hope this clarifies things?
Tim
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GREP(1) General Commands Manual GREP(1)
NAME
grep - search a file for a pattern
SYNOPSIS
grep [ option ... ] pattern [ file ... ]
DESCRIPTION
Grep searches the input files (standard input default) for lines (with newlines excluded) that match the pattern, a regular expression as
defined in regexp(6). Normally, each line matching the pattern is `selected', and each selected line is copied to the standard output.
The options are
-c Print only a count of matching lines.
-h Do not print file name tags (headers) with output lines.
-i Ignore alphabetic case distinctions. The implementation folds into lower case all letters in the pattern and input before interpre-
tation. Matched lines are printed in their original form.
-l (ell) Print the names of files with selected lines; don't print the lines.
-L Print the names of files with no selected lines; the converse of -l.
-n Mark each printed line with its line number counted in its file.
-s Produce no output, but return status.
-v Reverse: print lines that do not match the pattern.
Output lines are tagged by file name when there is more than one input file. (To force this tagging, include /dev/null as a file name
argument.)
Care should be taken when using the shell metacharacters $*[^|()= and newline in pattern; it is safest to enclose the entire expression in
single quotes '...'.
SOURCE
/sys/src/cmd/grep.c
SEE ALSO
ed(1), awk(1), sed(1), sam(1), regexp(6)
DIAGNOSTICS
Exit status is null if any lines are selected, or non-null when no lines are selected or an error occurs.
GREP(1)