Bash `loop` statements

for loop

For loops allow repeated execution of a command sequence based on an iteration variable. Bash supports two kinds of for loop, a “list of values” and a “traditional” c-like method.

for varname in list

Note that

  • Bash for, in, do and done are keywords
  • list contains a list of items, which can be in the statement or fetched from a variable that contains several words separated by spaces.
  • If list is missing from the for statement, then bash uses positional parameters that were passed into the shell.

Example 1:

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