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I'm using Ubuntu 14.04. When logged in as root, I'm tryhing to run a command as anotehr (postgres). However, it is failing

root@remotebox:/home/rails/myproject# su - postgres 'pg_upgradecluster 9.3 main'
-su: pg_upgradecluster 9.3 main: No such file or directory

What am I doing wrong?

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You're trying to pass 'pg_upgradecluster 9.3 main' to the default shell for postgres user. Depending on postgres user configuration this may mean to execute 'pg_upgradecluster 9.3 main' file in postgres PATH, and this is the reason you get a "No such file or directory error".

Try pass the argument as a command (-c):

su - postgres -c 'pg_upgradecluster 9.3 main'

as a shell:

su - postgres -s /path/to/pg_upgradecluster -- 9.3 main

or to explicit choose the shell:

su - postgres -s /bin/bash -- -c 'pg_upgradecluster 9.3 main'

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