stdin

STDIN Example

Demonstrates how to read from STDIN.

This example was generated with:

$ bashly init --minimal
# ... now edit bashly.yml to match ...
$ bashly generate
# ... now edit *.sh to match ...
$ bashly generate

---

bashly.yml

name: cli
help: STDIN Example
version: 0.1.0

args:
- name: path
  
  # Set the default path value to -, which is the standard operator for stdin.
  default: "-"
  help: Path to file (reads from stdin if empty)

flags:
- long: --file
  short: -f
  arg: path

  # This is also supported in flags
  # Note that in both cases, your script needs to handle the value '-' as there
  # is no special treatment in bashly, other than allowing '-' as argument.
  default: "-"
  help: Another path to file

src/root_command.sh

inspect_args

# Since cat knows how to handle '-' as a value, it will work with both a file
# path and '-' argument.
cat "${args[path]}"

# To read the file yourself, use something like this
#
# if [[ "${args[path]}" == "-" ]]; then
#   file=$(</dev/stdin)
# else
#   file=$(<"${args[path]}")
# fi

Output

$ ./cli some-file

args:
- ${args[--file]} = -
- ${args[path]} = some-file
some file with some content

$ cat some-file | ./cli

args:
- ${args[--file]} = -
- ${args[path]} = -
some file with some content

$ cat some-file | ./cli -

args:
- ${args[--file]} = -
- ${args[path]} = -
some file with some content