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?
Code:
sed '/^[ \o11]*$/d' blank
grep -v "^[ \o11]*$" blank
(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.
Waiting eagerly for your valuable replies.
Moderator's Comments:
edit by bakunin: please use CODE-tags
I find it hard to believe that either of these commands did what you want. The \o11 needs to be \011 (i.e., digit zero; not lowercase letter oh).
To make it clearer to readers, you could also replace your bracket expression with [[:space:]].
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/^*/ /'
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$$
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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)
04-11-2013
