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| -rw-r--r-- | doc_src/math.txt | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/doc_src/math.txt b/doc_src/math.txt index a29a3a83..b58527f9 100644 --- a/doc_src/math.txt +++ b/doc_src/math.txt @@ -8,8 +8,13 @@ math is used to perform mathematical calcualtions. It is only a very thin wrapper for the bc program, that makes it possible to specify an -expression from the commandline without using non-standard extensions +expression from the command line without using non-standard extensions or a pipeline. Simply use a command like <code>math 1+1</code>. For a description of the syntax supported by math, see the manual for -the bc program. +the bc program. Keep in mind that parameter expansion takes place on +any expressions before they are evaluated. This can be very useful in +order to perform calculations involving environment variables or the +output of command substitutions, but it also means that parenthesis +have to be escaped. + |