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cdbget.1
cdbget - search for records in cdb
cdbget [ -n ] k [s]
cdbget searches for a record with key k in a constant database. The constant database must be readable (and seekable) on cdbget's standard input.
Normally cdbget prints the data in the first record with key k and exits 0. If there is no record with the key k, cdbget exits 100 without printing anything.
If cdbget encounters a read error, write error, or database format error, it complains and exits 111.
Given a numeric s argument, cdbget skips past the first s records with key k, and prints the data in the next record.
The -n arguments append a null character to the key. This can be used to search for records created by cdb-database(8) which appends a null character to the key.
# Get records for domain example.com from /etc/indimail/users/cdb
$ cdbget '!example.com-' < /etc/indimail/users/cdb |cat -e;echo
example.com^@555^@555^@/var/indimail/domains/example.com^@-^@
# Get authentication api token for entry 'gmail' in
# the cdb file /etc/indmail/control/remote_auth.cdb
$ cdbget -n '!gmail' < /etc/indimail/control/remote_auth.cdb |cat -e;echo
mbhangui@gmail.com wwwwxxxxyyyyzzzz AUTH_SMTP=PLAIN
cdbgetm(1), cdbmake(1), cdbdump(1), cdbmake-12(1), cdbmake-sv(1),