Selective printing based on matched record Post: 302995666

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Top Forums Shell Programming and Scripting Selective printing based on matched record Post 302995666 by Don Cragun on Monday 10th of April 2017 09:22:09 AM

04-10-2017

Registered User

Quote:

Originally Posted by MadeInGermany

The index() function is described in

Code:

man awk

The (c && c--) is an implicit if condition; if it evaluates to true it prints $0 (the default action for an implicit if).
If c is non-zero it evaluates c-- that is also non-zero but then decrements c. After c times c is zero and it does no further decrement and no default-print.
I don't like c-->0 because it keeps c decrementing, hoping it will not underflow or wrap around after a zillion times.

Code:

awk -v A=5 '(/^0[67][MV]/ && index($0,"003529")==26) {c=A+1} (c && c--)' file

Note that index($0,"003529")==26 may give a false negative result if the string 003529 appears starting at offset 26 and at some other place in the line before position 26. If there is any chance that that string could occur at an earlier position in the line, the ERE used by Scrutinizer (updated to match your complete requirements ^0[67][MV].{22}003529) or the substring check used by RudiC (substr($0, 26, 6) == "003529") would be safer.

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LEARN ABOUT NETBSD

set_color

set_color(1)							       fish							      set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
       font color, while set_color --bold white will result in a white font color.

       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
       incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1							  Sun Jan 8 2012						      set_color(1)