Thanks Vgresh for your quick help, but i think i am not able to explain my problem properly.
can you please also explain a bit about '*' in sed?
I tried but i am really getting confused with this.
* does not work by itself in a regular expression. It means 'zero or more of the previous character'.
. means 'any character'.
So if you wanted a, something, c, you could do a.*c
Last edited by Corona688; 12-03-2012 at 05:35 PM..
It is probably a problem in understanding, not in using:
Suppose you have a string
and you want to match it, based on the "a" and the "c" occurring. You are looking for one occurrence of "a", followed by whatever, followed by one occurrence of "c". But if you look for "zero (or more) occurrences of 'a'", you basically don't care for the "a" at all - "zero or more" can also be "zero", which means there is no "a" there.
This begs the question what an expression like "a*" is good for, if it means that the "a" is optional at all. Well, suppose the following:
This would match any "x", followed by zero or more "a"s, followed by "y". Strings matched by this would be:
Not matched would be:
In other words: our expression means that between "x" and "y" only "a"s are allowed - regardless how many, even zero - but if there is anything in between "x" and "y" it has to be "a"s and "a"s alone.
Hi All
I am using GNU/Linux
This is regarding the get command to retrieve files (filename with wild card characters) from remote server.
I thought Get command can retrieve only 1 file irrespective of the files it has on the remote server And it is the function of mget to retrieve all... (7 Replies)
Hi Experts,
I have a string with colon delimited, want 2nd colon to be changed to a pipe.
data:
101:8:43:4:72:14:41:69:85:3:137:4:3:0:4:0:9:3:0:3:12:3:
I am trying with sed, but can change only 1 occurance:
echo "101:8:43:4:72:14:41:69:85:3:137:4:3:0:4:0:9:3:0:3:12:3:" | sed 's/:/|/2'... (5 Replies)
Discussion started by: rveri
5 Replies
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Majority of the questions are pertaining file/string parsing w.r.t
sed
or
awk
It would be nice to have these two as their own sub category under shell-programming-scripting which can avoid lot of duplicate posts. (1 Reply)
logs:
"/home/abc/public_html/index.php"
"/home/abc/public_html/index.php"
"/home/xyz/public_html/index.php"
"/home/xyz/public_html/index.php"
"/home/xyz/public_html/index.php"
how to use "cut" or "awk" or "sed" to get the following result:
abc
abc
xyz
xyz
xyz (8 Replies)
Hello everyone
Sorry I have to add another sed question. I am searching a log file and need only the first 2 occurances of text which comes after (note the space) "string " and before a ",". I have tried
sed -n 's/.*string \(*\),.*/\1/p' filewith some, but limited success. This gives out all... (10 Replies)
Hi,
I have line in input file as below:
3G_CENTRAL;INDONESIA_(M)_TELKOMSEL;SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL
My expected output for line in the file must be :
"1-Radon1-cMOC_deg"|"LDIndex"|"3G_CENTRAL|INDONESIA_(M)_TELKOMSEL"|LAST|"SPECIAL_WORLD_GRP_7_FA_2_TELKOMSEL"
Can someone... (7 Replies)
hi,
I have a problem about the Oracle related components. I'm not able to find any answer yet, and waiting for your responses...
Here is the configuration of my system:
* an IBM P550 machine,
* an AIX 5.3 running on it and
* an oracle database, already installed on it.
The problem (or... (1 Reply)
hi,
I have
* an IBM P550 machine,
* an AIX 5.3 running on it and
* an oracle database, already installed on it.
The problem (or question of my own) is:
Oracle tns listener, "CT_LISTENER", and the enterprise manager (EM) of the instance, which is uniq instance and called... (0 Replies)