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Top Forums Shell Programming and Scripting Removing one or more blank characters from beginning of a line Post 302668243 by babom on Monday 9th of July 2012 04:31:48 AM
Old 07-09-2012
Removing one or more blank characters from beginning of a line

Hi,

I was trying to remove the blank from beginning of a line.

when I try:

Code:
sed 's/^ +//' filename

it does not work
but when I try
Code:
sed 's/^ *//' filename

it works
But I think the first command should have also replaced any line with one or more blanks.
Kindly help me in understanding why the first command did not work.
 

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FBB::lm(3bobcat)					      OFoldStream manipulator						  FBB::lm(3bobcat)

NAME
FBB::lm - Manipulator setting left margins of OFoldStream objects SYNOPSIS
#include <bobcat/ofoldstream> or #include <bobcat/ofoldstreambuf> Linking option: -lbobcat DESCRIPTION
The lm class implements a manipulator that can be inserted into OFoldStream objects to set the stream's left margin to a requested value. Depending on the tab-setting of the OFoldStream the inserted value represents the number of blank space characters or the number of tab-characters that will be used for the left margin. The request will be processed at the next newline character or std::flush or std::endl manipulator that is inserted into the stream. If a line is still once an lm object and a flush manipulator are inserted into the stream then the new left margin will be effective at the next word inserted into that line (cf., the example section below). A bad_cast exception is thrown when the manipulator is inserted into an ostream that is not using a OFoldStreambuf buffer. NAMESPACE
FBB All constructors, members, operators and manipulators, mentioned in this man-page, are defined in the namespace FBB. INHERITS FROM
- CONSTRUCTOR
o lm(size_t newValue): The standard copy constructor is available. MEMBER FUNCTIONS
There are no public or protected member functions in this class. EXAMPLE
#include <iostream> #include <bobcat/ofoldstream> using namespace std; using namespace FBB; int main() { OFoldStream out(cout, 0, 80); out << "hello world (left margin is 0)" << lm(4) << " " "this uses a 4 character wide left margin " << lm(0) << flush << "at column 0 again "; return 0; } FILES
bobcat/lm - defines the class interface SEE ALSO
bobcat(7), manipulators(3bobcat), mlm(3bobcat), ofoldstream(3bobcat) BUGS
None Reported. DISTRIBUTION FILES
o bobcat_3.01.00-x.dsc: detached signature; o bobcat_3.01.00-x.tar.gz: source archive; o bobcat_3.01.00-x_i386.changes: change log; o libbobcat1_3.01.00-x_*.deb: debian package holding the libraries; o libbobcat1-dev_3.01.00-x_*.deb: debian package holding the libraries, headers and manual pages; o http://sourceforge.net/projects/bobcat: public archive location; BOBCAT
Bobcat is an acronym of `Brokken's Own Base Classes And Templates'. COPYRIGHT
This is free software, distributed under the terms of the GNU General Public License (GPL). AUTHOR
Frank B. Brokken (f.b.brokken@rug.nl). libbobcat1-dev_3.01.00-x.tar.gz 2005-2012 FBB::lm(3bobcat)
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