shell script equivalent for tcl function

Shell Programming and Scripting
1

Hello,

I need experts help in converting the below tcl function to korn shell function equivalent.

proc lsNetMaskToBits {mask} {
set dw [lsNetIpToDword $mask] ; # Top N bits set
set dw 0x[format %X $dw] ; # Make sure it's hexadecimal, else XOR fails.
puts "lsNetMaskToBits dw $dw"
set dw [expr $dw ^ 0xFFFFFFFF] ; # Complement => low 32-N bits set.
for {set nb 32} {$dw != 0} {incr nb -1} {set dw [expr $dw >> 1]}
return $nb
}

where lsNetIpToDword function returns hexadecimal value of IP address

for example: 255.255.0.0
lsNetIpToDword returns: FFFF0000

Thanks for your help

  • JackMelson
2

With ksh93:

netmask=255.255.0.0
hexnetmask=$(printf "%02X%02X%02X%02X" ${netmask//./ })

alternative / ksh88:

netmask=255.255.0.0
hexnetmask=$(echo $netmask | awk -F'.' '{printf "%02X%02X%02X%02X", $1, $2,$3, $4}')