linux - psql return code if zero rows found -


i psql command fail if 0 rows found:

psql -u postgres -d db -c "select * user id=1 , name='joe';"

i want able check return value. return 0 process(!) if @ least 1 row exists , return non-zero psql process if no such row exists. how can set return code if no rows found?

i don't think psql can itself, if want see if there rows or not exit status combine like

psql -u postgres -d db -t -c "select * user id=1 , name='joe'" | egrep .

that cause egrep exit non-zero if cannot match anything. -t make not print column headers , summary information, may need tweak command line if need stuff.


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