Command call containing variables in Ksh

When a command containing variable A is stored in a variable B, it is possible to make an error when using $ ($b). As the following code can sometimes be executed successfully, sometimes a "ipcs|grep xxx can not be found" error occurs.

Ifs= "" If Islinux then ipcscmd= "IPCS" Else ipcscmd= "Ipcs|grep $LOGNAME" fi for Eachline in $ ($IPCSCMD) do ifs= "" # Handle IPCs ... done

The root of the problem should be the analysis of Ipcscmd. If you change the code to the following form, you can do it correctly. Notice the change of IFS--after changing to the form below, you must change the IFS within the loop to space and tab.

Ifs= "" If Islinux then IPCs else Ipcs|grep $LOGNAME fi | While read eachline does ifs= "" # Space and Tab # Handle IPCs ... done