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Full Discussion: Grep -q -F , what is the function of this script
Top Forums Shell Programming and Scripting Grep -q -F , what is the function of this script Post 303022772 by Aia on Thursday 6th of September 2018 07:27:14 PM
Old 09-06-2018
Quote:
Originally Posted by baris35
[...]
Code:
grep -q -F 'addprestart.sh' /usr/bin/enigma2_pre_start.sh || \
echo '/bin/sh /etc/enigma2/addprestart.sh > \/dev/null 2>&1 & sleep .5 &' >>
/usr/bin/enigma2_pre_start.sh

[...]
The -q means to be quiet or do not output anything to stdout but only exit with a zero (success) as soon as one match is found.
The -F means to interpret the search pattern as a string and not as a regular expression. In this case find the literal string "addprestart.sh" in the file /usr/bin/enigma2_pre_start.sh

I do not know if you missed it but there's an OR logic operator in the command which means if that grep exit with other than zero the echo is executed.

In more human words, append the line /bin/sh /etc/enigma2/addprestart.sh to the script /usr/bin/enigma2_pre_start.sh if it doesn't have it already.
Last edited by Aia; 09-06-2018 at 08:42 PM.. Reason: Human
This User Gave Thanks to Aia For This Post:
baris35
 

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LEARN ABOUT SUNOS

getusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

       /bin/bash		  /bin/csh
       /bin/jsh 		  /bin/ksh
       /bin/pfcsh		  /bin/pfksh
       /bin/pfsh		  /bin/sh
       /bin/tcsh		  /bin/zsh
       /sbin/jsh		  /sbin/pfsh
       /sbin/sh 		  /usr/bin/bash
       /usr/bin/csh		  /usr/bin/jsh
       /usr/bin/ksh		  /usr/bin/pfcsh
       /usr/bin/pfksh		  /usr/bin/pfsh
       /usr/bin/sh		  /usr/bin/tcsh
       /usr/bin/zsh		  /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

SunOS 5.10							    30 Aug 2004 						  getusershell(3C)
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