until -- Command

Execute commands repeatedly
until sequence1 [ do sequence2 ] done

The  shell's until  loop executes  the commands in  sequence1. If  the exit
status is  nonzero, the  shell then executes  the commands in  the optional
sequence2 and  repeats the  process until the  exit status of  sequence1 is
zero.  Because  the shell recognizes  a reserved word only  as the unquoted
first word of a command, both do and done must occur either unquoted at the
start of a line or preceded by `;'.

The shell  commands break and  continue may be  used to alter  control flow
within an  until loop.  The contruct  while has the same  form as until but
the sense of the test is reversed.

The shell executes until directly.

See Also

break,
commands,
continue,
ksh,
sh,
test,
while

© 2012 by Stephen A. Ness