tclexecstattclsh

stat missing operand error when run from tcl file using exec

I have the following in script.tcl:

#!/usr/bin/env tclsh
set disk(free) [exec -- stat -f -c 'scale=3;(%a*%S)/1024/1024/1024' / | bc ]

When I execute the script, I get the following output: (translated from Hungarian)

stat: missing operand
For more information execute the „stat --help” command.
    while executing
"exec -- stat -f -c 'scale=3"
    invoked from within
"set disk(free) [exec -- stat -f -c 'scale=3;(%a*%S)/1024/1024/1024' / | bc ]"
    (file "~/script.tcl" line 2)

What am I doing wrong? Running the command on it's own works just fine.

Solution

  • You have to brace your expressions instead of single quotes.

    % exec stat -f -c {scale=3;(%a*%S)/1024/1024/1024} / | bc
137.916
%