Or use equality (==) instead of pattern matching (~). The ~ operator will match the pattern anywhere in the field.
aju_kup's solution to use a better pattern is of course a perfectly good solution as well; just pointing out an alternative which may be more convenient in some situations.
I found below script to check whether the variable is a digit in ksh.
############################
#!/bin/ksh
REPLY="3f"
if ]*\)'` != ${REPLY} && "${REPLY}" != "0" ]]
then
print "is digit\n"
else
print "not digit\n"
fi
############################
Although it works fine, but... (6 Replies)
Folks,
Is there a simple way to replace one digit by two digit using sed.
Example,
mydigit1918_2006_8_8_lag1.csv should be
mydigit1918_2006_08_08_lag01.csv.
I tried this way, but doesn't work.
echo mydigit1989_2006_8_8_lag1.csv|sed 's/]/0]/'
Thank you, (5 Replies)
I have a var storing date
var=`date`
Now the date is returned as
Mon Feb 2 00:25:48 PST 2009
Is there any way to check the date field alone ("2" in above case) and if its a single digit then add a prefix 0 to it and store the result in same variable "var"
My intention in above case is... (3 Replies)
I have to write a c program which takes a 3 digit number n and calculates the value of (2^n)+1 and then determines the number is prime or not.
I have tried to first calculate the value of 2^n and then adding one to it and then apply the logic of prime number.
but the ultimate problem is that... (7 Replies)
Hi,
Does anybody know what the below means:
I have a program containing the following and am trying to understand what it does:
temp=$(echo $count2 | tr -cd )
Cheers
Paul
Please start using code tags (2 Replies)
Hi all,
Need your help here. I have a file with thousand of lines, as shown in example below
KDKJAA 98324
OIDSAJ 324
KJAJAK 100
KJKAJK 89
JOIJOI 21
JDKDJL 12
UOIUOD 10
UDUYDS 8
UIUHKK 6
I would like to grep using... (5 Replies)
Thanks of your suggestions i was able to calculate the delta between some numbers in a column file with .
awk 'BEGIN{last=0}{delta=$1-last; last=$1; print $0" "delta}'
the file was like
499849120.00
500201312.00
500352416.00
500402784.00
500150944.00
499849120.00
500150944.00... (3 Replies)
Discussion started by: Board27
3 Replies
LEARN ABOUT PLAN9
grep
GREP(1) General Commands Manual GREP(1)NAME
grep - search a file for a pattern
SYNOPSIS
grep [ option ... ] pattern [ file ... ]
DESCRIPTION
Grep searches the input files (standard input default) for lines (with newlines excluded) that match the pattern, a regular expression as
defined in regexp(6). 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.
-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.
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 '...'.
SOURCE
/sys/src/cmd/grep.c
SEE ALSO ed(1), awk(1), sed(1), sam(1), regexp(6)DIAGNOSTICS
Exit status is null if any lines are selected, or non-null when no lines are selected or an error occurs.
GREP(1)