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Full Discussion: How to echo "#" to files?
Top Forums Shell Programming and Scripting How to echo "#" to files? Post 302864455 by Yongfeng on Wednesday 16th of October 2013 02:22:10 PM
Old 10-16-2013
Hi, I also tested it today and it works fine. But here I actually want to make it automatic, which means once take a file, we can go through each line of it, extract the line and echo it to another file. Here's the code:

Code:
 i=bin.sh
           echo "#!/bin/bash" > bundle.sh  
           number=`wc -l < $i`  #count the number of lines
           count=1
           while [ $count -le $number ]
           do
                 tmp=`sed -n "$count,1p" $i`   #extract the $count-th line
                 echo "echo $tmp" >> $i" >> bundle.sh
                 count=$(($count+1))
done

As you can see, the above code generates commands that will recreate file bin.sh, and exports these commands to another script called bundle.sh. So when bundle.sh is run, bin.sh is supposed to be generated. but if we encountered some special characters such as # and ; in bin.sh (the file to be recreated somewhere else), the second echo in echo "echo $tmp >> $i" >> bundle.sh won't be able to pass $tmp to $i because this command outputs: echo #contents or contents; >> bin.sh, codes after # will be interpreted as comments and ; will be interpreted as end of the line. Haven't found a way to figure it out yet. Many thanks.
Last edited by Yongfeng; 10-16-2013 at 03:28 PM..
 

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bundle

BUNDLE(1)																 BUNDLE(1)

NAME

       bundle - Ruby Dependency Management

SYNOPSIS

       bundle COMMAND [--no-color] [--verbose] [ARGS]

DESCRIPTION

       Bundler manages an application's dependencies through its entire life across many machines systematically and repeatably.

       See  the  bundler website http://gembundler.com for information on getting started, and Gemfile(5) for more information on the Gemfile for-
       mat.

OPTIONS

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	      Prints all output without color

       --verbose
	      Prints out additional logging information

BUNDLE COMMANDS

       We divide bundle subcommands into primary commands and utilities.

PRIMARY COMMANDS

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	      Install the gems specified by the Gemfile or Gemfile.lock

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	      Update dependencies to their latest versions

       bundle package(1) bundle-package.1.html
	      Package the .gem files required by your application into the vendor/cache directory

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	      Execute a script in the context of the current bundle

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	      Specify and read configuration options for bundler

       bundle help(1)
	      Displays this help page

UTILITIES

       bundle check(1)
	      Determine whether the requirements for your application are installed and available to bundler

       bundle list(1)
	      Show all of the gems in the current bundle

       bundle show(1)
	      Show the source location of a particular gem in the bundle

       bundle outdated(1)
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       bundle console(1)
	      Start an IRB session in the context of the current bundle

       bundle open(1)
	      Open an installed gem in the editor

       bundle viz(1)
	      Generate a visual representation of your dependencies

       bundle init(1)
	      Generate a simple Gemfile, placed in the current directory

       bundle gem(1)
	      Create a simple gem, suitable for development with bundler

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	      Displays platform compatibility information

       bundle clean(1)
	      Cleans up unused gems in your bundler directory

OBSOLETE

       These commands are obsolete and should no longer be used

       o   bundle lock(1)

       o   bundle unlock(1)

       o   bundle cache(1)

								    March 2013								 BUNDLE(1)
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