Bash scripting multiple conditions in while loop

Question

I m trying to get a simple while loop working in bash that uses two conditions  but after trying many different syntax from various forums  I can t stop throwing an error  Here is what I have   while    stats -gt 300   -o    stats -eq 0     I have also tried   while     stats -gt 300         stats -eq 0          as well as several others constructs  I want this loop to continue while  stats is  gt  300 or if  stats   0

User · Answer

The extra     on the outside of your second syntax are unnecessary  and possibly confusing   You may use them  but if you must you need to have whitespace between them   Alternatively   while    stats -gt 300         stats -eq 0

User · Answer

The correct options are  in increasing order of recommendation      Single POSIX test command with -o operator  not recommended anymore     Quotes strongly recommended to guard against empty or undefined variables  while     stats  -gt 300 -o   stats  -eq 0      Two POSIX test commands joined in a list with       Quotes strongly recommended to guard against empty or undefined variables  while     stats  -gt 300          stats  -eq 0      Two bash conditional expressions joined in a list with     while     stats -gt 300           stats -eq 0       A single bash conditional expression with the    operator  while     stats -gt 300     stats -eq 0       Two bash arithmetic expressions joined in a list with         optional  as a string can only be interpreted as a variable while    stats  gt  300          stats    0       And finally  a single bash arithmetic expression with the    operator      optional  as a string can only be interpreted as a variable while    stats  gt  300    stats    0      Some notes    Quoting the parameter expansions inside           and         is optional  if the variable is not set  -gt and -eq will assume a value of 0  Using   is optional inside            but using it can help avoid unintentional errors  If stats isn t set  then    stats  gt  300    will assume stats    0  but     stats  gt  300    will produce a syntax error

User · Answer

Try   while    stats -gt 300 -o  stats -eq 0       is a call to test  It is not just for grouping  like parentheses in other languages  Check man   or man test for more information

[bash] Bash scripting, multiple conditions in while loop

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