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Expand words, and execute commands once for each member in the resultant list, with name bound to the current member.

      for name [in words ...]; do commands; done
If `in words' is not present, the for command executes the commands once for each positional parameter that is set, as if `in "$@"' had been specified (see section Special Parameters). The return status is the exit status of the last command that executes. If there are no items in the expansion of words, no commands are executed, and the return status is zero. An alternate form of the for command is also supported:
for (( expr1 ; expr2 ; expr3 )) ; do commands ; done
First, the arithmetic expression expr1 is evaluated according to the rules described below . The arithmetic expression expr2 is then evaluated repeatedly until it evaluates to zero.

Each time expr2 evaluates to a non-zero value, commands are executed and the arithmetic expression expr3 is evaluated. If any expression is omitted, it behaves as if it evaluates to 1.

The return value is the exit status of the last command in list that is executed, or false if any of the expressions is invalid.

"In expanding the field of knowledge, we but increase the horizon of ignorance" - Henry Miller

Related commands:

- Conditionally perform a command
eval - Evaluate several commands/arguments
if - Conditionally perform a command
gawk - Find and Replace text within file(s)
m4 - Macro processor
until - Execute commands (until error)
while - Execute commands