search patternA first, when matched, put the $2(assume it contains patternB) in the variable pat, then go through the whole file content and print out all the lines contain patternB
Hello All,
I have a following task that I need to accomplish through a script or program and I am looking for some help as I have exhausted my ideas.
1. given: a text file with thousands of lines
2. find: pattern A in file and get line number ( grep -n works)
3. find: the first occurence of... (14 Replies)
Hi,
this is fantastic forum for shell programming and scripting,
so please let me to introduce you with my very old concept to
have web form/s with radio, select, input fields
and have an application generating valid, syntax error free scripting code.
The same or alike questions are asked... (2 Replies)
Hi all,
In a script like :
job_date=....
ls -l 2>/dev/null |
awk -v var =$job_date '
/Name\.Version\.+\.xml$/ {
How can i include a script variable job_date store in "var" in the pattern "/Name\.Version\.+\.xml$/"
Thanks in advance (12 Replies)
I have a file which is
DFDG
START
DSFDS
DSDS
XXX
END (VIO)
AADD
START
SDSD
FGFG
END
and I have to print the lines between START and END (VIO). In the files there are multiple places where START would be followed by END with few lines in between but I need to print only if START is... (18 Replies)
I may be making this too hard on myself, but I'm trying to find a way that I can use a cut or awk string to always remove the last two delimited fields of a string.
Say I have
PackageName-U939393-8.2.3.4.s390x.rpm
But the s390x could be any string w/o periods in it, x8664 for example,... (9 Replies)
How to reverse search for a matched string in a file. Get line# of the first matched line. I am getting '2' into 'lineNum' variable.
But it feels like I am using too many commands. Is there a better more efficiant way to do this on Unix?
abc.log
aaaaaaaaaaaaa
bbbbbbbbbbbbb... (11 Replies)
Hello,
Can anyone explain for me in this script to reverse the string?
1) the "x=x" part, how it works?
$ echo welcome | awk '{ for(i=length;i!=0;i--)x=x substr($0,i,1);}END{print x}'
$ emoclew2) x seems to be an array at the END, but can it automatically print the whole array in awk?
Thanks... (8 Replies)
I need help in awk script to do contains search and my requirement is below
I need to check if the value in each column is present in any other column and print it. And in some columns these value could be existing with comma as delimiter.
Sample data... (6 Replies)
GOODNUMBERS="1 2 3 4 5 6 3 3 34 34 5 66 12"
BADNUMBERS="7 3 12 5 66"
for eachnum in `echo ${GOODNUMBERS}`
do
echo ${BADNUMBERS} | gawk -v threshold=${eachnum} '$1 != threshold'
done
what im trying to do with the above is, i want to print numbers that are in the GOODNUMBERS... (10 Replies)
Discussion started by: SkySmart
10 Replies
LEARN ABOUT PLAN9
grep
GREP(1) General Commands Manual GREP(1)NAME
grep - search a file for a pattern
SYNOPSIS
grep [ option ... ] pattern [ file ... ]
DESCRIPTION
Grep searches the input files (standard input default) for lines (with newlines excluded) that match the pattern, a regular expression as
defined in regexp(6). 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.
-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.
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 '...'.
SOURCE
/sys/src/cmd/grep.c
SEE ALSO ed(1), awk(1), sed(1), sam(1), regexp(6)DIAGNOSTICS
Exit status is null if any lines are selected, or non-null when no lines are selected or an error occurs.
GREP(1)