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Full Discussion: Function to add escape character before specified character
Top Forums Shell Programming and Scripting Function to add escape character before specified character Post 302881597 by RudiC on Monday 30th of December 2013 12:33:10 PM
Old 12-30-2013
Try also
Code:
awk -v X="& ;" -v E='\' '{gsub(/./,"&|",X); sub (/.$/,"", X); gsub (X, "\\" E "&")}1' <<< 'abcd fkaj&dsdsd'
abcd\ fkaj\&dsdsd

If you know the escape char is back slash, this may work:
Code:
awk -v X="& ;" -v E='\' '{gsub(/./,"&|",X); sub (/.$/,"", X); gsub (X, E E "&")}1' <<< 'abcd fkaj&dsdsd'
abcd\ fkaj\&dsdsd

Yoda's approach misses the space special char as that is used as a separator by the split function.

EDIT: Even simpler:
Code:
awk -v X="& ;" -v E='\' '{ gsub ("["X"]", E E "&")}1' <<< 'abcd fkaj&dsdsd'
abcd\ fkaj\&dsdsd

Last edited by RudiC; 12-30-2013 at 01:40 PM..
This User Gave Thanks to RudiC For This Post:
Anupam_Halder
 

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LEARN ABOUT CENTOS

clubak

CLUBAK(1)						     ClusterShell User Manual							 CLUBAK(1)

NAME

       clubak - format output from clush/pdsh-like output and more

SYNOPSIS

       clubak [ OPTIONS ]

DESCRIPTION

       clubak  formats	text  from  standard input containing lines of the form "node:output".	It is fully backward compatible with dshbak(1) but
       provides additonal features. For instance, clubak always displays its results sorted by node/nodeset.

       You do not need to use clubak when using clush(1) as all output formatting features are already included  in.  It  is  provided	for  other
       usages, like post-processing results of the form "node:output".

       Like clush(1), clubak uses the ClusterShell.MsgTree module of the ClusterShell library (see pydoc ClusterShell.MsgTree).

INVOCATION

       clubak should be started with connected standard input.

OPTIONS

       --version
	      show clubak version number and exit

       -b, -c gather nodes with same output (-c is provided for dshbak(1) compatibility)

       -d, --debug
	      output more messages for debugging purpose

       -L     disable header block and order output by nodes

       -r, --regroup
	      fold nodeset using node groups

       -s GROUPSOURCE, --groupsource=GROUPSOURCE
	      optional groups.conf(5) group source to use

       -G, --groupbase
	      do not display group source prefix (always @groupname)

       -S SEPARATOR, --separator=SEPARATOR
	      node / line content separator string (default: :)

       -F, --fast
	      faster but memory hungry mode (preload all messages per node)

       -T, --tree
	      message tree trace mode; switch to enable ClusterShell.MsgTree trace mode, all keys/nodes being kept for each message element of the
	      tree, thus allowing special output gathering

       --color=WHENCOLOR
	      whether to use ANSI colors to surround node or nodeset prefix/header with escape sequences to display them in color on the terminal.
	      WHENCOLOR  is never, always or auto (which use color if standard output refers to a terminal). Color is set to [34m (blue foreground
	      text) and cannot be modified.

       --diff show diff between gathered outputs

EXIT STATUS

       An exit status of zero indicates success of the clubak command.

EXAMPLES

       1. clubak can be used to gather some recorded clush(1) results:

       Record clush(1) results in a file:
	      # clush -w node[1-7] uname -r >/tmp/clush_output
	      # clush -w node[32-159] uname -r >>/tmp/clush_output

       Display file gathered results (in line-mode):
	      # clubak -bL </tmp/clush_output

       2. Another example, iterate over node* text files in current directory and gather characters count for all of them:
	     # find -name "node*" -exec wc -c {} ; | awk '{ gsub("./","",$2); print $2": "$1 }' | clubak -bL
	     node[1,3]: 7
	     node2: 9

SEE ALSO

       clush(1), nodeset(1), groups.conf(5).

BUG REPORTS

       Use the following URL to submit a bug report or feedback:
	      https://github.com/cea-hpc/clustershell/issues

AUTHOR

       Stephane Thiell, CEA DAM  <stephane.thiell@cea.fr>

COPYRIGHT

       CeCILL-C V1

1.6								    2012-03-28								 CLUBAK(1)
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