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Full Discussion: Command to extract word from a string
Top Forums Shell Programming and Scripting Command to extract word from a string Post 302897645 by wisecracker on Tuesday 15th of April 2014 09:24:39 AM
Old 04-15-2014
Totally longhand using __builtins__, CygWin bash under Windows Vista...
All done with understandable variables so you can see how it works...
Code:
#!/bin/bash
# sub_str.sh
my_string="This is a component catalogue..."
substring="a c"
substring_length=3
subscript=0
for subscript in $( seq 0 1 $(( ${#my_string} - 3 )) )
do
	if [ "${my_string:$subscript:$substring_length}" == "$substring" ]
	then
		echo "Substring ~$substring~ found in ~$my_string~ at position $(( $subscript + 1 ))..."
	fi
done
exit 0

result for string "a c"...
Code:
AMIGA:~> cd /tmp
AMIGA:/tmp> dos2unix sub_str.sh
dos2unix: converting file sub_str.sh to Unix format ...
AMIGA:/tmp> ./sub_str.sh
Substring ~a c~ found in ~This is a component catalogue...~ at position 9...
AMIGA:/tmp> _

 

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LEARN ABOUT OSF1

dos2unix

dos2unix(1)						      General Commands Manual						       dos2unix(1)

NAME

       dos2unix - mtools utility to convert a DOS file to UNIX

SYNOPSIS

       dos2unix msdosfile

OPTIONS

       None

OPERANDS

       Name of the file to convert.

DESCRIPTION

       The dos2unix command converts a file from DOS format to UNIX format.  The converted file replaces the original file.

       Subdirectory  names  that contain the '/' or '' separator are supported.  If you use the '' separator or wildcards, you must enclose file
       names in quotes to protect them from the shell.

       The mcd command can be used to establish the device and the current working directory (relative to DOS), otherwise the default is A:.

EXIT STATUS

       The following exit values are returned: Success.  Failure.

ENVIRONMENT VARIABLES

       The following environment variables affect the execution of dos2unix: If set, this variable names the file that contains the  name  of  the
       current mtools working directory as established by the mcd command.  If this variable is not set, the file $HOME/.mcwd is used.

FILES

       Contains  the  name  of	the  current mtools working directory as established by the mcd command.  If this file does not exist, the default
       mtools working directory is A:.  Executable file

SEE ALSO

       Commands:  mcopy(1), mread(1), mtools(1) mtype(1), mwrite(1)

																       dos2unix(1)
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