No way I'm typing in an example with 90+ characters. Here is one with ISS at position 11 in a couple of lines....
Code:
$ cat data
12345678901234567890
ISS 123 ISS
sjjsISSjjjISS1234
$ sed -n 's/^\(.\{10\}\)ISS.*$/\1/p' < data
ISS 123
sjjsISSjjj
$
Only lines 2 and 3 were output. Line 1 was ignored, no "ISS" at position 11. The early ISS in line 3 is retained. The ISS at position 11 and all characters following that ISS were dropped. The second version would drop only the ISS, so in line 3, that trailing "1234" would move over to position 11.
So it is working exactly like I expected. And as I said, I am only guessing as to what you wanted. I guess that I guessed wrong. *shrug* You can't win them all.
Hi! I'm trying to find a way to extract a certain amount of lines from a log file. This would allow me to "follow" a web user through our log files.
Here is a sample fake log file to explain what i want to accomplish :
BEGIN REQUEST sessionID=123456
boatload of lines for thread-1 detailing... (8 Replies)
I need to extract the character before the last "|" in the following lines, which are 'N' and 'U'. The last "|" shouldn't be extracted. Also the no.s of "|" may vary in a line, but I need only the character before the last one.
... (1 Reply)
Hi there,
My samba configuration file looks like that :
...
...
path = /home/samba/profiles/
...
path = /home/samba/shares/family
valid users = family
path = /home/samba/shares/admins
valid users = admins
path = /home/samba/shares/publicI want to extract the list of standard... (3 Replies)
Hi All,
I need to extract 543 from the command below :
# pvscan
PV /dev/sdb1 VG vg0 lvm2
Total: 1 543.88 GB] / in use: 1 / in no VG: 0
I have the following command which does the job, but I think this could be achieved in a more simple way using sed or awk. Any help is... (7 Replies)
Hi,
Could anyone clearly explain me the below sed construct in detail to get to know what it actually does?
sed 's/\(* *\)//4'
echo 'test;10;20' | sed 's/*;\(*\)/\1/' (1 Reply)
Hi,
I am trying to extract the first and last lines for each unique item in column 2 of a large text file and then concatenate all extracted lines together in a new text file.
So ... I want to go from this format:
NEW 0088-BPM 1.042700e+04 877168.19 9718360.00 1496.00
NEW 0088-BPM... (5 Replies)
Hi,
I have a file like this-
aa
12
23
34
aa
21
34
56
aa
78
45
56
I want to print out only the lines after the last aa. How do I do this? I tried using grep -A and sed -n, but both didnt work as I wanted to.
Could someone help me out please.. (3 Replies)
Hi everyone!
I'm writting a function in .bashrc to extract some text from a file. The file looks like this:
" random text
Begin CG step 1
random text
Begin CG step 2
...
Begin CG step 100
random text"
For a given number, let's say 70, I want all the text between "Begin CG... (4 Replies)
Hi All
I am trying to remove the line having specific pattern from a file by using sed command
I have the file named ODS_REP_SRCE_File.txt with content as:
... (1 Reply)
Discussion started by: Shilpi Gupta
1 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)
03-16-2006
*shrug* You can't win them all.