I was just thinking about it, and I guess this isn't the most helpful was to explain this. I'm going to add some comments (in bold) to the code, so you can see what's happening step by step:
Quote:
Originally posted by LivinFree The exit 0 tells it to exit successfully (remember $?), and exit 2 tells it that there were errors, and to exit right away. I hope this is a little more helpful
This is one of many ways to do it...
By saying this is one of many, I mean it - here is an example of a one-liner that will do nearly the same thing without the error handling or variables: As you can see, the "grep" command is the same as in the script, but the messages are handled differently. The commands after the "&&" will execute if the previous command was successful, and the command after the "||" will execute if it was not successful.
Geez, I'd make a horrible teacher...
Last edited by LivinFree; 09-14-2001 at 04:54 AM..
hi all,
the problem is like this...... i setup a file (Env.txt) which handles all the values.
NAME1=xxxxxx, where xxxxx is the value
NAME2=xxxxxx
GGGGG=uusufu
I have 6 files, where i will append the values from env.txt. These files has no specific format. all i want is to append the... (1 Reply)
Hi All,
I have a file that I need to be able to find a pattern match on a line, search that line for a text pattern, and replace that text.
An example of 4 lines in my file is:
1. MatchText_randomNumberOfText moreData ReplaceMe moreData
2. MatchText_randomNumberOfText moreData moreData... (4 Replies)
I have a script which has several occurences of statement like
command: $UCMDPATH/xyz abc
I would like to replace the entire line starting from $UCMDPATH with the ls -ltr command
eg:
Prior to change::
command: $UCMDPATH/xyz abc
After change:
command: ls -ltr
Is there a way to do... (12 Replies)
Hello,
I really would appreciate some help with a bash script for some string manipulation on an SQL dump:
I'd like to be able to rename "sites/WHATEVER/files" to "sites/SOMETHINGELSE/files" within the sql dump.
This is quite easy with sed:
sed -e... (1 Reply)
Dear All,
i want to search particular string and want to replance next line value.
following is the test file.
search string is
tmp,???
,10:1 "???" may contain any 3 character it should remain the same and next line replace with ,10:50
tmp,123 --- if match tmp,??? then... (3 Replies)
I am trying to search and replace using two different files with strict search rules.
One file contain some data and the other file contain some numbers as shown below.
DataFile.txt
>L1_T1
text data...
text data..
>L1_T1
text data...
text data..
>L1_T1
text data...
text data..
........ (4 Replies)
Hi all,
I am editing a config file in vi that has a / on it.
At the moment, search and replace looks alright as am able to use a # as a temporary separator, i.e. :,$s#/u01/app#/u02/app#g
For doing a search, I have to escape the / do. So if I want to search for /u01/app, I am having to do... (2 Replies)
Hi,
I need help with search and replace for the following string using vi ..
if ];then
to
if ];then
can this be done in one search and replace or need multiple ?
Thanks (3 Replies)
Hi Team,
I am new to unix, please help me in this.
I have a file named properties.
The content of the file is :
##Mobile props
east.url=https://qa.east.corp.com/prop/end
west.url=https://qa.west.corp.com/prop/end
south.url=https://qa.south.corp.com/prop/end... (2 Replies)
Discussion started by: tolearn
2 Replies
LEARN ABOUT POSIX
escape
escape(1) Mail Avenger 0.8.3 escape(1)NAME
escape - escape shell special characters in a string
SYNOPSIS
escape string
DESCRIPTION
escape prepends a "" character to all shell special characters in string, making it safe to compose a shell command with the result.
EXAMPLES
The following is a contrived example showing how one can unintentionally end up executing the contents of a string:
$ var='; echo gotcha!'
$ eval echo hi $var
hi
gotcha!
$
Using escape, one can avoid executing the contents of $var:
$ eval echo hi `escape "$var"`
hi ; echo gotcha!
$
A less contrived example is passing arguments to Mail Avenger bodytest commands containing possibly unsafe environment variables. For
example, you might write a hypothetical reject_bcc script to reject mail not explicitly addressed to the recipient:
#!/bin/sh
formail -x to -x cc -x resent-to -x resent-cc
| fgrep "$1" > /dev/null
&& exit 0
echo "<$1>.. address does not accept blind carbon copies"
exit 100
To invoke this script, passing it the recipient address as an argument, you would need to put the following in your Mail Avenger rcpt
script:
bodytest reject_bcc `escape "$RECIPIENT"`
SEE ALSO avenger(1),
The Mail Avenger home page: <http://www.mailavenger.org/>.
BUGS
escape is designed for the Bourne shell, which is what Mail Avenger scripts use. escape might or might not work with other shells.
AUTHOR
David Mazieres
Mail Avenger 0.8.3 2012-04-05 escape(1)