[awk]Несколько символов в FS

bash-4.0# man awk

User Commands                                              awk(1)

NAME
     awk - pattern scanning and processing language

SYNOPSIS
     /usr/bin/awk [-f progfile] [-Fc] [' prog '] [parameters]
          [filename]...

     /usr/xpg4/bin/awk [-FcERE] [-v assignment]... 'program' -f progfile...
          [argument]...

DESCRIPTION
     The /usr/xpg4/bin/awk utility is described  on  the  nawk(1)
     manual page.

...

     FS          input   field   separator   regular   expression
                 (default blank and tab)

$ echo "a,b c" | awk '{FS="[ ,]"} {print $2" "$3}'
b c

$ echo "a,b c" | gawk '{FS="[ ,]"} {print $2" "$3}'
c

-bash-3.00$ echo "a,b c" | awk '{FS="[ ,]"} {print $2" "$3}'

-bash-3.00$uname -a
SunOS stend-sun-1 5.10 Generic_118833-33 sun4u sparc SUNW,UltraAX-i2

yunake@chiscadm02 ~ $ for s in chiscvigcfgst04 chiscspwebst01; do sudo ssh $s "uname -a && echo 'a,b c' | nawk '-F,| ' '{ print \$1, \$3 }'"; done 2> /dev/null
SunOS chiscvigcfgst04 5.9 Generic_122300-47 sun4u sparc SUNW,Sun-Fire-V240
a c
SunOS chidatscspweb01 5.10 Generic_141445-09 i86pc i386 i86pc
a c