Shell Script to rename files

yakuzaa · #1 (**permalink**) 03-21-2009

Hi, i need a bit of help writting a tcsh script which renames all ascii text files in the current directory by adding a number to their names before the extension

so for example, a directory containing the files

Hello.txt
Hello.t
Hello

should have the following changes,

Hello.txt should be converted to Hello_a1.txt
Hello.t should be converted to Hello_a2.t
Hello should be converted to Hello_a3

so it should put a _a and a number incrementing accordingly.
*********************************************************

Im new to tcsh scripting, though i tried implementing it, and this is where i get to.

#!/bin/tcsh
set n = 1
foreach f ( * )
echo file $f == ascii
if ( $? == 0 ) then
mv "$f:r" "$f:r"_a$n
@ n += 1
endif
end
echo $n changed

I am aware that some parts are incorrect, and that I might be missing something, thats where i need help.

thanks.

radoulov · #2 (**permalink**) 03-21-2009

You know you should not use (t)csh for scripting

But if you insist you may try this:

Code:

#!/bin/tcsh

set n = 0

foreach f ( * )
  set _type = `file "$f"`
  switch ( "$_type" )
    case *ASCII*:
      @ n ++
      switch ( "$f" )
        case *.*:
          mv -- "$f" "$f:r"_a"$n"."$f:e"
          continue
          breaksw
      endsw
      mv -- "$f" "$f"_a"$n"
      breaksw
    endsw
end
echo "$n file(s) changed."

cfajohnson · #3 (**permalink**) 03-21-2009

Quote:

Originally Posted by yakuzaa

Hi, i need a bit of help writting a tcsh script

[t]csh is not recommended for scripting:

Top Ten Reasons not to use the C shell
Csh problems
Csh Programming Considered Harmful

Quote:

which renames all ascii text files in the current directory by adding a number to their names before the extension

so for example, a directory containing the files

Hello.txt
Hello.t
Hello

should have the following changes,

Hello.txt should be converted to Hello_a1.txt
Hello.t should be converted to Hello_a2.t
Hello should be converted to Hello_a3

so it should put a _a and a number incrementing accordingly.
*********************************************************

Im new to tcsh scripting, though i tried implementing it, and this is where i get to.

#!/bin/tcsh
set n = 1
foreach f ( * )
echo file $f == ascii
if ( $? == 0 ) then
mv "$f:r" "$f:r"_a$n
@ n += 1
endif
end
echo $n changed

Code:

#!/bin/sh
n=1
for f in *
do
  ftype=$(file "$f")
  case $ftype in
     *ASCII*) ext=${f%%*.}
              mv "$f" "${f#.*}_a$n.$ext}"
              n=$(( $n + 1 ))
              ;;
  esac
done

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