Anything will match the empty string; regular expressions look for a match anywhere, and finding "nothing" anywhere trivially matches. You need to anchor it to make it more picky about what to find. $7 ~ /^$/ checks for an empty string (beginning of string adjacent to end of string) but it's probably more efficient to simply use equivalence comparison against the empty string.
Also, avoid the Useless Use of grep | grep | awk.
Code:
MEM=`ps v $PPID | awk 'tolower ($0) ~ /[d]b2/ { if ($7 == "") print 0; else print $7; }
guys forget the find command coz with find command u can't get condational output like grep. I will give small example :-
Apr 10 09:12 aacbl222_12aug1998.lqc
Apr 10 09:12 sscbl4534_4sep2001.lqc
Apr 10 09:12 ah66fmi_5jan1997.lqc
Apr 10 09:12 y313h1_7sep1998.lqc
May 11 09:12... (5 Replies)
Hi Friends,
Can any of you explain me about the below line of code?
mn_code=`env|grep "..mn"|awk -F"=" '{print $2}'`
Im not able to understand, what exactly it is doing :confused:
Any help would be useful for me.
Lokesha (4 Replies)
Hi,
I don't know hot to make this command work:
ls -laR | grep "^-" | awk '{print $9}'| grep "$.txt"
It should return the list of file .txt
It's important to search .txt at the end of the line, becouse some file name have "txt" in their name but have other extensions (13 Replies)
Hi all,
grep '\~' b | awk '{print $1","$3}' | sed -e 's/~//g'
Iam using above command for some report...
can this be done using any one of them either sed or awk or grep... (3 Replies)
Hi all,
can any one suggest me the script to grep multiple strings from ps -ef
pls correct the below script . its not working/
i want to print OK if all the below process are running in my solaris system. else i want to print NOT OK.
bash-3.00$ ps -ef | grep blu
lscpusr 48 42 ... (11 Replies)
Hello.
Following recommendations for one of my threads, this is working perfectly :
#!/bin/bash
CNT=$( grep -c -e "some text 1" -e "some text 2" -e "some text 3" "/tmp/log_file.txt" )
Now I need a grep success for some thing like :
#!/bin/bash
CNT=$( grep -c -e "some text_1... (4 Replies)
I've been working on this for 2 days and I'm not getting far. It is time to turn to you guys.
With the data below, I am trying to create a file that looks like this: I'd like to use some form of egrep I think.
AY#box#P04prod_to_contingency s AY#cmd#P04dump_cont_db s AY#cmd#P04get_on_ice_job s... (2 Replies)
All
I have a requirement to search and pick the data as below. Explained with example.
38999|4812 Highway 52 North|Rockville|55901|0196
67541|2800 Dexter Road|Northville|38999|0196
This is pipe separate data. First column represents dealer id and 4th column represents the zip code where... (4 Replies)
Hi
Is it possible to get the below code working.?
cmd="grep 'Name:' |awk -F' ' '{print $2}'|xargs -i basename {}"
echo $cmd
(
rman target / <<EOF1
LIST COPY ;
exit
EOF1
) | `$cmd`
in nutshell I want to be able to preset cmd as depending on script flow it can be... (2 Replies)
I have a content.xls file as given below,
NC_020815.1 1891831 1894692 virb4_A0A0H2X8Z4_ 1 954 1945
NC_020815.1 1883937 1886123 vird4_A0A0P9KA26_ 1 729 1379
NC_020815.1 2976151 2974985 virb10_H8FLU5_Ba 1 393 478
NC_020815.1 2968797 2967745 virb6_A0A0Q5GCZ4 5 398 499... (2 Replies)
Discussion started by: dineshkumarsrk
2 Replies
LEARN ABOUT PLAN9
regexp
REGEXP(6) Games Manual REGEXP(6)NAME
regexp - regular expression notation
DESCRIPTION
A regular expression specifies a set of strings of characters. A member of this set of strings is said to be matched by the regular
expression. In many applications a delimiter character, commonly bounds a regular expression. In the following specification for regular
expressions the word `character' means any character (rune) but newline.
The syntax for a regular expression e0 is
e3: literal | charclass | '.' | '^' | '$' | '(' e0 ')'
e2: e3
| e2 REP
REP: '*' | '+' | '?'
e1: e2
| e1 e2
e0: e1
| e0 '|' e1
A literal is any non-metacharacter, or a metacharacter (one of .*+?[]()|^$), or the delimiter preceded by
A charclass is a nonempty string s bracketed [s] (or [^s]); it matches any character in (or not in) s. A negated character class never
matches newline. A substring a-b, with a and b in ascending order, stands for the inclusive range of characters between a and b. In s,
the metacharacters an initial and the regular expression delimiter must be preceded by a other metacharacters have no special meaning and
may appear unescaped.
A matches any character.
A matches the beginning of a line; matches the end of the line.
The REP operators match zero or more (*), one or more (+), zero or one (?), instances respectively of the preceding regular expression e2.
A concatenated regular expression, e1e2, matches a match to e1 followed by a match to e2.
An alternative regular expression, e0|e1, matches either a match to e0 or a match to e1.
A match to any part of a regular expression extends as far as possible without preventing a match to the remainder of the regular expres-
sion.
SEE ALSO awk(1), ed(1), sam(1), sed(1), regexp(2)REGEXP(6)