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check if command exists
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| # 1. use command -v | |
| command -v foo >/dev/null 2>&1 || { echo >&2 "I require foo but it's not installed. Aborting."; exit 1; } | |
| # 2. use type . | |
| if ! type "$foobar_command_name" > /dev/null; then | |
| # install foobar here | |
| fi |
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