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> $ maths exp="sqrt(ia*ia - ib*ib)" ia=s8a20110719_00014_0003_nep.sdf
I always omit spaces in TRANSFORM expressions on the command line to
avoid parsing issues,
maths exp="sqrt(ia*ia-ib*ib)"
Otherwise you need to escape the quotes because of the spaces
maths exp='"sqrt(ia*ia - ib*ib)"'
as the double quotes need to be passed literally to the application.
Malcolm