09-13-2009
Need to replace one string, in a file, with another string from a different file ...
Hi,
I have a requirement to extract a variable string (say S1) from a given file (say File-A), and look for a certain pattern to find another string (say S2) in another file (say File-B) and replace S2 with S1.
An example could be:
You have got two password shadow files -
1) shadow1
2) shadow2
These files are colon (":") seperated fields (like any "/etc/shadow" file has).
I now need to look for a user (say 'David'); user entry is the first field in both the shadow files (both of the shadow files are having multiple users along with the user 'David') and replace the second field in the shadow files (which is the actual encrypted password string) of file 'shadow1' with the corressponding field in file 'shadow2' for the user 'David.
Password strings could be of any lengths and may contain all kinds of possible characters.
An example of AWK/gawk script would be the most desired on which can be embedded/called from a bash script.
However any method of solving this problem using Linux bash will do well for me.
Thank you very much in advance.
Last edited by Praveen_218; 09-13-2009 at 10:01 AM..
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LEARN ABOUT PHP
mb_eregi_replace
MB_EREGI_REPLACE(3) 1 MB_EREGI_REPLACE(3)
mb_eregi_replace - Replace regular expression with multibyte support ignoring case
SYNOPSIS
string mb_eregi_replace (string $pattern, string $replace, string $string, [string $option = "msri"])
DESCRIPTION
Scans $string for matches to $pattern, then replaces the matched text with $replacement.
PARAMETERS
o $pattern
- The regular expression pattern. Multibyte characters may be used. The case will be ignored.
o $replace
- The replacement text.
o $string
- The searched string.
o $option
-$option has the same meaning as in mb_ereg_replace(3).
RETURN VALUES
The resultant string or FALSE on error.
NOTES
Note
The internal encoding or the character encoding specified by mb_regex_encoding(3) will be used as the character encoding for this
function.
Warning
Never use the e modifier when working on untrusted input. No automatic escaping will happen (as known from preg_replace(3)). Not
taking care of this will most likely create remote code execution vulnerabilities in your application.
SEE ALSO
mb_regex_encoding(3), mb_ereg_replace(3).
PHP Documentation Group MB_EREGI_REPLACE(3)