$0,$1,$2 and set - in shell ,awk ,sed,function ,perl
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set – a b c …
tells ksh to assign $1 = a, $2 = b, $3 = c … as if the script had been called: script a b c …
Then the script can use normal command line parsing tools like getopts.
IFS is the input field separator. By default this is set to white space (space, tab, or newline). By adding ‘%’, ksh will replace % with a space when a variable is echoed.
set –A arrayName a b c … creates an array and assigns members arrayName[0]=a, arrayName[1]=b, arrayName[2]=c…
specail symbol :
it represent parameter all , parameter 1,2,3 ....for shell ,awk ,function
for awk, $1 $2 , are also used in -F
for regular match
sed use \1
perl usr $(1)
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