How to remove duplicates in C shell Array?

Shell Programming and Scripting
1

Please help me on this

My script name is uniqueArray.csh

#!/bin/csh
set ARRAY = ( one teo three one three )
set ARRAY = ( $ARRAY one five three five  )

How to remove the duplicates in this array ,sort and save those in the same variable or different variable.

Thanks in the advance

2

What have you tried?

3

The following works with csh builtins but does not sort.

#!/bin/csh -f
set ARRAY=( one two three one three )
echo "<$ARRAY>"
set NARRAY=( )
foreach i ( $ARRAY:q )
  if ( " $NARRAY " !~ *" $i "* ) then
    set NARRAY=( $NARRAY:q $i:q )
  endif
end
set ARRAY=( $NARRAY:q )
echo "<$ARRAY>"

--
While testing I saw a(nother) tcsh bug: * and ? cannot be escaped in the =~ and !~ operators.

if ( x =~ ? ) echo true
if ( x =~ "?" ) echo true
if ( x =~ \? ) echo true

Only the first one should say true.
The bug is in tcsh 6.14 until the current 6.18 (not in 6.13 and earlier).

1 Like
4

I finally got a script for removing duplicates and sorting in c shell script.

#!/bin/csh
set my_array = ( y z a b a a c )
set my_array = `echo $my_array | sed 's/ /\n/g' | sort -u`
echo $my_array

my output is

 
    a b c y z

---------- Post updated at 04:14 PM ---------- Previous update was at 04:00 PM ----------

Thank you .your script is working.:slight_smile: