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Every option to ledger may be set using an environment variable. If
an option has a long name such --this-option, setting the
environment variable LEDGER_THIS_OPTION
will have the same
affect as specifying that option on the command-line. Options on the
command-line always take precedence over environment variable
settings, however.
Note that you may also permanently specify option values by placing option settings in the file ~/.ledgerrc, for example:
--cache /tmp/.mycache --pager /usr/bin/less