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Full Discussion: Global search and replace across multiple files
Top Forums Shell Programming and Scripting Global search and replace across multiple files Post 302468536 by Scott on Wednesday 3rd of November 2010 05:46:05 AM
Old 11-03-2010
There are a number of problems with sanjaypraj's script:

Code:
#/bin/ksh             # Missing ! after #
for k in `find ./ -type f| xargs grep oldstring  # No closing backquote, and expect an Arg list too long error
do
   filename=`echo $k | cut -d ":" -f1`  # not sure why this is needed
   sed 's/oldstring/newstring/g' $filename >${filename}.bk
   mv ${filename}.bk ${filename}  # This is dangerous
done

Code:
find . -type -f | while read FILE; do
  sed "s/oldstring/newstring/g" $FILE > $FILE.new
  cp -f $FILE.new $FILE && rm $FILE.new
done

Code:
# This is dangerous.  Suppose your "sed" updates an important system file...
$ ls -l rc.tcpip
-rwxrwxr--    1 root     system         6610 Oct 23 09:33 rc.tcpip
 
$ sed "s/old/new/g" rc.tcpip > rc.tcpip.new
 
$ ls -l rc.tcpip.new
-rw-r--r--    1 root     system         6610 Nov 3 10:49 rc.tcpip.new
 
$ mv rc.tcpip.new rc.tcpip
 
$ ls -l rc.tcpip
-rw-r--r--    1 root     system         6610 Nov 3 10:49 rc.tcpip

And when you reboot three months later....
Last edited by Scott; 11-03-2010 at 07:06 AM.. Reason: cut & paste error; typo
 

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GRUB-RENDER-LABEL(1)                                               User Commands                                              GRUB-RENDER-LABEL(1)

NAME

       grub-render-label - generate a .disk_label for Apple Macs.

SYNOPSIS

       grub-render-label [OPTION...] [OPTIONS]

DESCRIPTION

       Render Apple .disk_label.

       -b, --bgcolor=COLOR
              use COLOR for background

       -c, --color=COLOR
              use COLOR for text

       -f, --font=FILE
              use FILE as font (PF2).

       -i, --input=FILE
              read text from FILE.

       -o, --output=FILE
              set output filename. Default is STDOUT

       -t, --text=STRING
              set the label to render

       -v, --verbose
              print verbose messages.

       -?, --help
              give this help list

       --usage
              give a short usage message

       -V, --version
              print program version

       Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.

REPORTING BUGS

       Report bugs to <bug-grub@gnu.org>.

SEE ALSO

       The  full  documentation  for grub-render-label is maintained as a Texinfo manual.  If the info and grub-render-label programs are properly
       installed at your site, the command

              info grub-render-label

       should give you access to the complete manual.

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