Calling grep on a per line basis is silly. The shell has many pattern matching builtins like case that are faster for plain string detection. You can do this best with 2 grep's or one sed or awk or perl
Last edited by DGPickett; 01-10-2013 at 05:07 PM..
Hi
I would like to know wheather there is anyway to pass a variable to grep argument like this
grep "$myvar" $myfile
i would put this in a function and then call this function by setting different values to myvar and myfile.
is this possible at all.
regards
Hrishy (4 Replies)
I have a large file that I am grepping to find a certain string.
grep 'C:\Data\Directory\Test.txt' test.txt
It can not find it even though I know it is in there . I know that there is a problem with the backslashes but I can't get it to work. I tried
grep... (2 Replies)
Hi there, this is a very simple question.
When I do grep -c "PWD" filename, I get 5. This means the filename contains 5 lines of "PWD" occurence.
I tried to assign to a variable. int= grep -c "PWD" filename
When I typed echo $int
The output:
5
I get an empty line space. Now I... (1 Reply)
I have a problem. Suppose I have a log named transport.log
>>
tp finished with return code: 203
meaning:
wrong syntax in tp call
....
tp finished with return code: 0
meaning:
Everything ok.
<<
What i want to do is to get the return code of the 1st one. So I would probably do:... (2 Replies)
Changed Problem its a sed actually...
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
Use a sed command to create an output file from the input file. The input... (2 Replies)
Hi,
When i try this it is not executing either result or total, pls can any one help me in this.
max=month_134.log
grep result|total $max > log.txt
In month_134.log, it should contain either result or total and then send it to log.txt.It should execute result or total in log.txt
... (3 Replies)
Hi
I am trying to grep a string in a directory which is having 5000 files.
PA>> grep -iH 'linc.unisure_pr13n' *
bash: /usr/bin/grep: Arg list too long
I am getting the error. i also tried
PA>> ls -ltr | grep -iH 'linc.unisure_pr13n' *
but still i am getting the error
Please Advice... (4 Replies)
Hi everyone
i am facing a strange problem in grep below is the code
RC=0
grep $ERROR_MASK $LOG_FILE 2>&1 > /dev/null && RC=1 || RC=0
what does the above statment do i mean it search for error mask into log file and redirect the error to console null then what's the meaning of RC=1 ||... (2 Replies)
Hello. I'm learning shell scripting right now and I'm trying simple scripts. I have a problem with the one below. The idea is to found the number of files containing asd in their name. Here's the code:
#!/bin/sh
pattern=asd
total=0
for f in *
do
&& continue
if grep $pattern $f >... (3 Replies)
I don't know if you guys get this problem sometimes at Terminal but I had been having this problem since yesterday :( Maybe I overdid the Terminal. Even the codes that used to work doesn't work anymore.
Here is what 's happening:
* I wanted to remove lines containing digits so I used this... (25 Replies)
Discussion started by: Nexeu
25 Replies
LEARN ABOUT DEBIAN
plan9-grep
GREP(1) General Commands Manual GREP(1)NAME
grep, g - search a file for a pattern
SYNOPSIS
grep [ option ... ] pattern [ file ... ]
g [ option ... ] pattern [ file ... ]
DESCRIPTION
Grep searches the input files (standard input default) for lines that match the pattern, a regular expression as defined in regexp(7) with
the addition of a newline character as an alternative (substitute for |) with lowest precedence. 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.
-e The following argument is taken as a pattern. This option makes it easy to specify patterns that might confuse argument parsing,
such as -n.
-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.
-f The pattern argument is the name of a file containing regular expressions one per line.
-b Don't buffer the output: write each output line as soon as it is discovered.
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 '...'. An expression starting with '*' will treat the rest of the expression as literal characters.
G invokes grep with -n and forces tagging of output lines by file name. If no files are listed, it searches all files matching
*.C *.b *.c *.h *.m *.cc *.java *.cgi *.pl *.py *.tex *.ms
SOURCE
/src/cmd/grep
/bin/g
SEE ALSO ed(1), awk(1), sed(1), sam(1), regexp(7)DIAGNOSTICS
Exit status is null if any lines are selected, or non-null when no lines are selected or an error occurs.
GREP(1)