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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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LEARN ABOUT DEBIAN

bping

BPING(1)							  BP executables							  BPING(1)

NAME

       bping - Send and receive Bundle Protocol echo bundles.

SYNOPSIS

       bping [-c count] [-i interval] [-p priority] [-q wait] [-r flags] [-t ttl] srcEID destEID [reporttoEID]

DESCRIPTION

       bping sends bundles from srcEID to destEID.  If the destEID echoes the bundles back (for instance, it is a bpecho endpoint), bping will
       print the round-trip time.  When complete, bping will print statistics before exiting.  It is very similar to ping, except it works with
       the bundle protocol.

       bping terminates when one of the following happens: it receives the SIGINT signal (Ctrl+C), it receives responses to all of the bundles it
       sent, or it has sent all count of its bundles and waited wait seconds.

EXIT STATUS

       These exit statuses are taken from ping.

       0   bping has terminated normally, and received responses to all the packets it sent.

       1   bping has terminated normally, but it did not receive responses to all the packets it sent.

       2   bping has terminated due to an error.  Details should be noted in the ion.log log file.

FILES

       No configuration files are needed.

ENVIRONMENT

       No environment variables apply.

DIAGNOSTICS

       Diagnostic messages produced by bping are written to the ION log file ion.log and printed to standard error.  Diagnostic messages that
       don't cause bping to terminate indicate a failure parsing an echo response bundle.  This means that destEID isn't an echo endpoint: it's
       responding with some other bundle message of an unexpected format.

       Can't attach to BP.
	   bpadmin has not yet initialized Bundle Protocol operations.

       Can't open own endpoint.
	   Another application has already opened ownEndpointId.  Terminate that application and rerun.

       bping bundle reception failed.
	   BP system error.  Check for earlier diagnostic messages describing the cause of the error; correct problem and rerun.

       No space for ZCO extent.
	   ION system error.  Check for earlier diagnostic messages describing the cause of the error; correct problem and rerun.

       Can't create ZCO.
	   ION system error.  Check for earlier diagnostic messages describing the cause of the error; correct problem and rerun.

       bping can't send echo bundle.
	   BP system error.  Check for earlier diagnostic messages describing the cause of the error; correct problem and rerun.

BUGS

       Report bugs to <ion-bugs@korgano.eecs.ohiou.edu>

SEE ALSO

       bpecho(1), bptrace(1), bpadmin(1), bp(3), ping(8)

perl v5.14.2							    2012-05-25								  BPING(1)
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