How will you remove blank lines from a file using sed and grep? ( blank line contains nothing or only white spaces).
I run the below commands of sed and grep but grep isn't giving output as desired. Why?
(there is a space before tab in character class)
The above sed command gave desired result but not grep. Why?
Also, I am fix at one more place. As, tab is 011 (octal) but in my system the zero of 011 is accepting as o (alphabetic) instead of numeral zero. If I give numeral zero, it won't work. Is it O.K.? A few days back by mistake a system file got deleted becz of which link count is not showing properly. Can this be a reason for the above problem.
I am really lost I don't know what this line does. Please help I'm very lost. Thanks in advance.
cat CPROGRAMS.c
|sed 's// /g'|tr ' ' '\012'
|grep ''
|sed 's/^*/ /'
|grep '($'|sort -u|tr -d "("` (4 Replies)
OK, I am trying to become more familiar with grep and sed.
I have a file that is storing some records. I am allowing a user to
search for a keyword in the file with this:
grep -i "$keyword" testFile|sed -n -e 's/^/\
/' -e 's/:/\
/gp'
... (15 Replies)
I have a file that contains many instances of double dollar signs. I want to use sed to get the first occurrence. for example, given the following data.
#Beginning of file
AB
34
$$
AB
$$
AB
98
$$
I only want to pull out:
AB
34
$$ (1 Reply)
Hi All,
I have created a bourne script that basically wants to split a file up in to different parts. I have this working if the file has all the information on different lines but if it doesn't then it doesn't work.
i.e.
If this is the file
hello
12345
good bye
6789
I could grep all the... (5 Replies)
hello everybody!
I have a html file which is not properly formatted meaning that the whole content is in one line.
I want to to cut out certain parts of that file. Those parts are between ' #" ' and ' " ' and always start with ' sec_ ' and after the ' sec_ ' any number of characters and ' _... (2 Replies)
HI all,
i have a line in a file it contains
Code:
one;two_1_10;two_2_10;two_3_10;three~
now i need to get the output as
Code:
one;two_1_abc_10;two_2_abc_10;two_3_abc_10;three~ ( 1 should be replaced with 1_abc for two__abc_10 , and one more thing the number of occurances of... (6 Replies)
So I have a html file with a bunch of words inside tags and I need to extract just the words, and I'm not sure exactly what the best way to do this is. The format is as follows:
<tr>
<td>word 1</td>
<td>word 2</td>
</tr>
And all I want to extract is the 'word 2'. First I tried... (3 Replies)
Hi,
I have a file with reoccurring patterns and I want extract the 3rd line after the match, then delete another pattern from that third line.
For example the file is in the following format:
Hello
Name: Abc
Number: 123
Hello
Name: FQE
Number: 543
This occurs more than 100... (4 Replies)
Hello Everyone!
I'm kind of new to parsing and would like extract a partial part of my nmap scan output so I can convert it to csv/excel:
My current file has two types of lines like this:
Nmap scan report for dns1 (1.1.1.1)
Nmap scan report for dns2 (2.2.2.2)
Nmap scan report for 3.3.3.3
... (3 Replies)
Hi ,
I have a file where i have modifed certain things compared to original file . The difference of the original file and modified file is as follows.
# diff mir_lex.c.modified mir_lex.c.orig
3209c3209
< if(yy_current_buffer -> yy_is_our_buffer == 0) {
---
>... (5 Replies)
Discussion started by: breezevinay
5 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)