02-03-2006
Hey Gaurav!
The output is with set -x enabled:
+ max
cat: soln.sh: No such file or directory
+ max=0
+ cat file.txt
+ read LINE
++ echo 1001 34.5 68.7 67
++ awk '{print $2}'
+ fir=34.5
++ echo 1001 34.5 68.7 67
++ awk '{print $3}'
+ sec=68.7
+ '[' 34.5 -gt 0 ']'
./max: line 9: [: 34.5: integer expression expected
+ '[' 68.7 -gt 0 ']'
./max: line 12: [: 68.7: integer expression expected
+ read LINE
++ echo 1002 22.0 40.1 32
++ awk '{print $2}'
+ fir=22.0
++ echo 1002 22.0 40.1 32
++ awk '{print $3}'
+ sec=40.1
+ '[' 22.0 -gt 0 ']'
./max: line 9: [: 22.0: integer expression expected
+ '[' 40.1 -gt 0 ']'
./max: line 12: [: 40.1: integer expression expected
+ read LINE
++ echo 1003 11.3 34.8 45
++ awk '{print $2}'
+ fir=11.3
++ echo 1003 11.3 34.8 45
++ awk '{print $3}'
+ sec=34.8
+ '[' 11.3 -gt 0 ']'
./max: line 9: [: 11.3: integer expression expected
+ '[' 34.8 -gt 0 ']'
./max: line 12: [: 34.8: integer expression expected
+ read LINE
+ grep 0 file.txt
1001 34.5 68.7 67
1002 22.0 40.1 32
1003 11.3 34.8 45
Regards
Kingkong
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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)