> -----Original Message----- > From: busybox-bounces at mail.busybox.net > [mailto:busybox-bounces at mail.busybox.net] On Behalf Of Aizer > Danny-BDA023 > Sent: Monday, January 17, 2005 07:34 > To: BusyBox (E-mail) > Subject: [BusyBox] BusyBox ash arithmetic operations > > Hello, > > I was trying to find out whether BusyBox supports simple arithmetic > operations with variables. Well, it depends on which shell you use, as BusyBox contains four different shells. Ash supports it, and I think msh does too. If you use ash, then you should enable CONFIG_ASH_MATH_SUPPORT to get arithmetic support. The syntax for the arithmetic expressions follow the standard posix shell (IEEE 1003.1) arithmetic syntax (i.e., the same as bash uses). > E.g., something like: > > wc1=`wc -l file1` > wc2=`wc -l file2` > > total=$wc1 + $wc2 ????? total=$(( $wc1 + $wc2 )) > if [ $total > MAX_WC ]; then if [ $total -gt MAX_WC ]; then > echo "squeak" > fi > > If it does not support such operations, is there any "workaround"? > > Thanks, > /Danny //Peter