Substitute particular char in a file Post: 302992944

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Top Forums UNIX for Beginners Questions & Answers Substitute particular char in a file Post 302992944 by Don Cragun on Friday 3rd of March 2017 02:41:37 PM

03-03-2017

Registered User

Quote:

Originally Posted by kshari8888

Thanks.
But the file is big one having 5000 records. I want to change only 154 th
char where the file is having 306 chars.

I'm lost. If you have a file with 5000 records, how can the file contain only 306 characters???

Are you saying that each record in your file has a fixed length of 306 characters (or bytes) and that you want to change the character in character position 154 from 1 to 0 if the "word" before that position is one of the three strings you specified in post #1?

Note that the sample input you provided does not have a total of 306 characters, does not have 306 character lines, does not have fixed length lines (records), and does not have the 1 that you want to change in a fixed position.

Are you just looking for a single character 1 following one of your three specified strings? Or, does it have to be a 1 followed by a <space> (so multi-digit numbers starting with a 1 as the 1st digit would not changed to have a leading 0)?

Do the varying numbers of <space> characters between fields in your lines have to be maintained? Or can strings of multiple adjacent <space>s be coalesced into a single <space>?

Is the 1 you want to change always the 4th field and the strings you are looking for always the 3rd field in a line (as in your sample input)?

Don Cragun

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LEARN ABOUT REDHAT

screennumberofccc

DisplayOfCCC(3X11)						  XLIB FUNCTIONS						DisplayOfCCC(3X11)

NAME

       DisplayOfCCC, VisualOfCCC, ScreenNumberOfCCC, ScreenWhitePointOfCCC, ClientWhitePointOfCCC - Color Conversion Context macros

SYNTAX

       DisplayOfCCC(ccc)
	    XcmsCCC ccc;

       VisualOfCCC(ccc)
	    XcmsCCC ccc;

       ScreenNumberOfCCC(ccc)
	    XcmsCCC ccc;

       ScreenWhitePointOfCCC(ccc)
	    XcmsCCC ccc;

       ClientWhitePointOfCCC(ccc)
	    XcmsCCC ccc;

ARGUMENTS

       ccc	 Specifies the CCC.

DESCRIPTION

       The DisplayOfCCC macro returns the display associated with the specified CCC.

       The VisualOfCCC macro returns the visual associated with the specified CCC.

       The ScreenNumberOfCCC macro returns the number of the screen associated with the specified CCC.

       The ScreenWhitePointOfCCC macro returns the screen white point of the screen associated with the specified CCC.

       The ClientWhitePointOfCC macro returns the client white point of the screen associated with the specified CCC.

SEE ALSO

       XcmsCCCOfColormap(3X11), XcmsConvertColors(3X11), XcmsCreateCCC(3X11), XcmsDefaultCCC(3X11), XcmsSetWhitePoint(3X11)
       Xlib - C Language X Interface

X Version 11							    Release 6.6 						DisplayOfCCC(3X11)

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