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Top Forums Shell Programming and Scripting Special characters in a bash variable in sed Post 302306270 by linuxnewbeee on Sunday 12th of April 2009 04:39:11 AM
Old 04-12-2009
Special characters in a bash variable in sed

Hello,

I am trying the following:
echo __CHANGEME__ >> testfile
VAR1="&&&"
sed -i "s|__CHANGEME__|${VAR1}|" testfile
cat testfile

This results in testfile containing
__CHANGEME____CHANGEME____CHANGEME__

Whereas I want it to result in
&&&

I understand that if
VAR1="\&\&\&"
then it would work.

But this is a simplified version of my script. In my actual script VAR1 is coming in as a user input/randomly generated ASCII string.

I also understand that I can write some code to insert escape characters in "VAR1". But I am hoping that there a more intelligent way to do this using sed only. For some reason '&' is the only special character that is causing problems.

Thanks in advance for your input.

Last edited by linuxnewbeee; 04-12-2009 at 05:48 AM..
 

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ipptool(1)							    Apple Inc.								ipptool(1)

NAME
ipptool - perform internet printing protocol requests SYNOPSIS
ipptool [ --help ] [ --stop-after-include-error ] [ --version ] [ -4 ] [ -6 ] [ -C ] [ -E ] [ -I ] [ -L ] [ -S ] [ -T seconds ] [ -V ver- sion ] [ -X ] [ -c ] [ -d name=value ] [ -f filename ] [ -i seconds ] [ -n repeat-count ] [ -q ] [ -t ] [ -v ] URI filename [ ... filenameN ] DESCRIPTION
ipptool sends IPP requests to the specified URI and tests and/or displays the results. Each named file defines one or more requests, including the expected response status, attributes, and values. Output is either a plain text, formatted text, CSV, or XML report on the standard output, with a non-zero exit status indicating that one or more tests have failed. The file format is described in ipptoolfile(5). OPTIONS
The following options are recognized by ipptool: --help Shows program help. --stop-after-include-error Tells ipptool to stop if an error occurs in an included file. Normally ipptool will continue with subsequent tests after the INCLUDE directive. --version Shows the version of ipptool being used. -4 Specifies that ipptool must connect to the printer or server using IPv4. -6 Specifies that ipptool must connect to the printer or server using IPv6. -C Specifies that requests should be sent using the HTTP/1.1 "Transfer-Encoding: chunked" header, which is required for conformance by all versions of IPP. The default is to use "Transfer-Encoding: chunked" for requests with attached files and "Content-Length:" for requests without attached files. -E Forces TLS encryption when connecting to the server using the HTTP "Upgrade" header. -I Specifies that ipptool will continue past errors. -L Specifies that requests should be sent using the HTTP/1.0 "Content-Length:" header, which is required for conformance by all versions of IPP. The default is to use "Transfer-Encoding: chunked" for requests with attached files and "Content-Length:" for requests without attached files. -S Forces (dedicated) SSL encryption when connecting to the server. -T seconds Specifies a timeout for IPP requests in seconds. -V version Specifies the default IPP version to use: 1.0, 1.1, 2.0, 2.1, or 2.2. If not specified, version 1.1 is used. -X Specifies that XML (Apple plist) output is desired instead of the plain text report. This option is incompatible with the -i (inter- val) and -n (repeat-count) options. -c Specifies that CSV (comma-separated values) output is desired instead of the plain text output. -d name=value Defines the named variable. -f filename Defines the default request filename for tests. -i seconds Specifies that the (last) file should be repeated at the specified interval. This option is incompatible with the -X (XML plist out- put) option. -l Specifies that plain text output is desired. -n repeat-count Specifies that the (last) file should be repeated the specified number of times. This option is incompatible with the -X (XML plist output) option. -t Specifies that CUPS test report output is desired instead of the plain text output. -v Specifies that all request and response attributes should be output in CUPS test mode (-t). This is the default for XML output. EXIT CODE
The ipptool program returns 0 if all tests were sucessful and 1 otherwise. COMPATIBILITY
The ipptool program is unique to CUPS. EXAMPLES
Get a list of completed jobs for "myprinter": ipptool ipp://localhost/printers/myprinter get-completed-jobs.test Send email notifications to "user@example.com" when "myprinter" changes: ipptool -d recipient=mailto:user@example.com ipp://localhost/printers/myprinter create-printer-subscription.test STANDARD FILES
The following standard files are available: color.jpg create-printer-subscription.test document-a4.pdf document-a4.ps document-letter.pdf document-letter.ps get-completed-jobs.test get-jobs.test get-notifications.test get-printer-attributes.test get-subscriptions.test gray.jpg ipp-1.1.test ipp-2.0.test ipp-2.1.test ipp-2.2.test ipp-everywhere.test onepage-a4.pdf onepage-a4.ps onepage-letter.pdf onepage-letter.ps print-job.test print-job-deflate.test print-job-gzip.test testfile.jpg testfile.pcl testfile.pdf testfile.ps testfile.txt validate-job.test SEE ALSO
ipptoolfile(5), http://localhost:631/help COPYRIGHT
Copyright 2007-2013 by Apple Inc. 13 May 2013 CUPS ipptool(1)
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