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Top Forums Shell Programming and Scripting Replace a null from grep to a number 0 using sed Post 302447673 by dgmm on Tuesday 24th of August 2010 03:13:01 AM
Old 08-24-2010
Replace a null from grep to a number 0 using sed

Hi
I have a file which contains count for a code. Code is first field and count is second field.
I am trying to search the code and get correspond count.

File look like this. temp.out
Code:
A 10
B  20

I am searching for C , if C is not there I will have get value 0.

I have written like this to get the count.

Code:
c=`grep "C " temp.out | awk '{print $2}'`

But this c is getting a null. How do I change it so that I will get zero instead of null.

Thanks and Regards
dgmm

Moderator's Comments:
Mod Comment Use code tags please.

Last edited by zaxxon; 08-24-2010 at 04:21 AM..
 

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STRING(3)						     Library Functions Manual							 STRING(3)

NAME
strcat, strncat, strcmp, strncmp, strcasecmp, strncasecmp, strcpy, strncpy, strlen, index, rindex - string operations SYNOPSIS
#include <strings.h> char *strcat(s, append) char *s, *append; char *strncat(s, append, count) char *s, *append; int count; strcmp(s1, s2) char *s1, *s2; strncmp(s1, s2, count) char *s1, *s2; int count; strcasecmp(s1, s2) char *s1, *s2; strncasecmp(s1, s2, count) char *s1, *s2; int count; char *strcpy(to, from) char *to, *from; char *strncpy(to, from, count) char *to, *from; int count; strlen(s) char *s; char *index(s, c) char *s, c; char *rindex(s, c) char *s, c; DESCRIPTION
These functions operate on null-terminated strings. They do not check for overflow of any receiving string. Strcat appends a copy of string append to the end of string s. Strncat copies at most count characters. Both return a pointer to the null- terminated result. Strcmp compares its arguments and returns an integer greater than, equal to, or less than 0, according as s1 is lexicographically greater than, equal to, or less than s2. Strncmp makes the same comparison but looks at at most count characters. Strcasecmp and strncasecmp are identical in function, but are case insensitive. The returned lexicographic difference reflects a conversion to lower-case. Strcpy copies string from to to, stopping after the null character has been moved. Strncpy copies exactly count characters, appending nulls if from is less than count characters in length; the target may not be null-terminated if the length of from is count or more. Both return to. Strlen returns the number of non-null characters in s. Index (rindex) returns a pointer to the first (last) occurrence of character c in string s or zero if c does not occur in the string. Set- ting c to NULL works. 4th Berkeley Distribution October 22, 1987 STRING(3)
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