Cfrgtkky

I have a script which converts expressions in different units to standard units like:
distance=1km -> distance=1000m.

This is my code:

#!/bin/bash

cat "$1" | grep '=' | awk -F= '{switch ($2) {

                    case  /^[0-9]+s$/ : print $1"="$2*1;

                    break;

                    case /^[0-9]+min$/ : print $1"="$2*60;

                    break; 

                    case /^[0-9]+h$/ : print $1"="$2*3600;

                    break;

                    case /^[0-9]+d$/ : print $1"="$2*3600*24;

                    break;

                    case /^[0-9]+mm$/ : print $1"="$2/1000;

                    break;

                    case /^[0-9]+sm$/ : print $1"="$2/100;

                    break;

                    case /^[0-9]+dm$/ : print $1"="$2/10;

                    break;

                    case /^[0-9]+m$/ : print $1"="$2*1;

                    break;

                    case /^[0-9]+km$/ : print $1"="$2*1000;

                    break;

                    case /^[0-9]+mg$/ : print $1"="$2/1000000;

                    break;

                    case /^[0-9]+g$/ : print $1"="$2/1000;

                    break;

                    case /^[0-9]+kg$/ : print $1"="$2*1;

                    break;

                    case /^[0-9]+t$/ : print $1"="$2*1000;

                    break; }

                }'

fi 

But when I'm trying to run it I have two errors:

awk: line 1: syntax error at or near {

awk: line 2: runaway regular expression / : print $ ...

I'm almost certain that the error is because your system is configured to use mawk (which currently does not appear to support the switch ... case construct) as the default implementation of awk - rather than gawk (GNU Awk):

$ sudo update-alternatives --set awk /usr/bin/mawk

update-alternatives: using /usr/bin/mawk to provide /usr/bin/awk (awk) in manual mode

$ 

$ echo 'abc:123' | awk -F: '{switch($2) {case /^[0-9]+$/: print $1; break;}}'

awk: line 1: syntax error at or near {

awk: line 1: runaway regular expression /: print $1 ...

whereas with GNU awk

$ sudo update-alternatives --set awk /usr/bin/gawk

update-alternatives: using /usr/bin/gawk to provide /usr/bin/awk (awk) in manual mode

$ 

$ echo 'abc:123' | awk -F: '{switch($2) {case /^[0-9]+$/: print $1; break;}}'

abc