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Full Discussion: Cannot get results from grep command
Top Forums Shell Programming and Scripting Cannot get results from grep command Post 302962032 by mohtashims on Monday 7th of December 2015 12:32:25 PM
Old 12-07-2015
Quote:
Originally Posted by RudiC
It works exactly as expected and prints the two lines as they are matching... Did you try with wildcards or sequences (e.g. " *")?
It does not print output anything ... that the problem ... i was expecting both the lines to be printed.

---------- Post updated at 12:32 PM ---------- Previous update was at 12:31 PM ----------

Quote:
Originally Posted by Aia
grep is not ignoring the white spaces, most likely the white spaces are not matching. i.e. it could be that white spaces are tabs or mix of tab and single spaces and you are using perhaps just spaces or any of those combinations.
This is what i think is happening ... but how will i be able to understand and grep if it has tabs and other white spaces !!
 

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LEARN ABOUT OPENDARWIN

col

COL(1)							    BSD General Commands Manual 						    COL(1)

NAME

     col -- filter reverse line feeds from input

SYNOPSIS

     col [-bfhpx] [-l num]

DESCRIPTION

     The col utility filters out reverse (and half reverse) line feeds so that the output is in the correct order with only forward and half for-
     ward line feeds, and replaces white-space characters with tabs where possible.  This can be useful in processing the output of nroff(1) and
     tbl(1).

     The col utility reads from the standard input and writes to the standard output.

     The options are as follows:

     -b      Do not output any backspaces, printing only the last character written to each column position.

     -f      Forward half line feeds are permitted (``fine'' mode).  Normally characters printed on a half line boundary are printed on the fol-
	     lowing line.

     -h      Don't output multiple spaces instead of tabs (default).

     -l num  Buffer at least num lines in memory.  By default, 128 lines are buffered.

     -p      Force unknown control sequences to be passed through unchanged.  Normally, col will filter out any control sequences from the input
	     other than those recognized and interpreted by itself, which are listed below.

     -x      Output multiple spaces instead of tabs.

     The control sequences for carriage motion that col understands and their decimal values are listed in the following table:

     ESC-7	      reverse line feed (escape then 7)
     ESC-8	      half reverse line feed (escape then 8)
     ESC-9	      half forward line feed (escape then 9)
     backspace	      moves back one column (8); ignored in the first column
     carriage return  (13)
     newline	      forward line feed (10); also does carriage return
     shift in	      shift to normal character set (15)
     shift out	      shift to alternate character set (14)
     space	      moves forward one column (32)
     tab	      moves forward to next tab stop (9)
     vertical tab     reverse line feed (11)

     All unrecognized control characters and escape sequences are discarded.

     The col utility keeps track of the character set as characters are read and makes sure the character set is correct when they are output.

     If the input attempts to back up to the last flushed line, col will display a warning message.

SEE ALSO

     expand(1), nroff(1), tbl(1)

STANDARDS

     The col utility conforms to Version 2 of the Single UNIX Specification (``SUSv2'').

HISTORY

     A col command appeared in Version 6 AT&T UNIX.

BSD
								   June 29, 1993							       BSD
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