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Top Forums Shell Programming and Scripting A few questions from a newbie(shell script) Post 302127684 by perk_bud on Thursday 19th of July 2007 04:26:39 AM
Old 07-19-2007
A few questions from a newbie(shell script)

Q1>How do i read and write to file in shell script. Here is what i want let's assume the filename as "file1"

Read file1

Check the content of file1 which can be either "0" or "1"

if(content == 0)
{
execute a command
}

flush file1(remove all contents in it)

write "1" in to file1

execute a few commands

flush file1(remove all contents in it)

write "0" in to the file

Q2>How do i store the result of a shell script command in a variable.For example

"dropdb something" - When i execute this command on bash it gives a message
"database dropped" how do i capture this in shell and store it in a variable and compare it

Thanks for helping me!
 

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diff3(1)						      General Commands Manual							  diff3(1)

NAME
diff3 - 3-way differential file comparison SYNOPSIS
file1 file2 file3 DESCRIPTION
compares three versions of a file, and prints disagreeing ranges of text flagged with these codes: all three files differ file1 is different file2 is different file3 is different The type of change required to convert a given range of a given file to some other is indicated in one of these ways: Text is to be appended after line number n1 in file f, where f = or Text is to be changed in the range line n1 through line n2. If n1 = n2, the range can be abbreviated to n1. The original contents of the range follows immediately after a indication. When the contents of two files are identical, the contents of the lower-numbered file is suppressed. Produces a script for the editor that can be used to incorporate into file1 all changes between file2 and file3 (see ed(1)); i.e., the changes that normally would be flagged and Produces a script to incorporate only changes flagged Produces a script to incorporate only changes flagged Produces a script that will incorporate all changes between file2 and file3, but treat overlapping changes (that is, changes that would be flagged with in normal listing) differently. The overlapping lines in both files will be inserted by the edit script bracketed by and lines. Produces a script that will incorporate only changes flagged , but treat these changes in the manner of option. The following command applies the resulting script to file1. EXTERNAL INFLUENCES
International Code Set Support Single- and multi-byte character code sets are supported. WARNINGS
Text lines that consist of a single period defeat Files longer than 64K bytes do not work. FILES
SEE ALSO
diff(1). diff3(1)
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