If you have a PostgreSQL dump in the custom format you can can view the text format dump (plain SQL statements).

You can output the contents to STDOUT:

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pg_restore $dumpname

You can apply the same parameters for the output of the textdump as for restoring the dump (for e.g. --clean to drop database objects before recreating them):

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pg_restore --clean $dumpname

To write the textdump to a file just use I/O redirection or the -f parameter:

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pg_restore $dumpname > textdump.sql
pgrestore -f textdump.sql $dumpname