57 lines
992 B
Markdown
57 lines
992 B
Markdown
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# Random bash
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Here's random useful bash stuff:
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## Check if program is installed
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Checks if `$1` is installed
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```bash
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#!/usr/bin/env bash
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command_exists() { type "$1" &> /dev/null; }
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if command_exists "$1"; then
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echo "$1 installed"
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else
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echo "$1 not installed"
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exit 1
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fi
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```
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### Check which package manager is installed
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```bash
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#!/usr/bin/env bash
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command_exists() { type "$1" &> /dev/null; }
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if command_exists "apt-get"; then
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PM="apt-get"
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elif command_exists "yum"; then
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PM="yum"
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elif command_exists "pacman"; then
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PM="pacman"
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elif command_exists "zypper"; then
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PM="zypper"
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elif command_exists "emerge"; then
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PM="emerge"
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elif command_exists "apk"; then
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PM="apk"
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else
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>&2 echo "Unsupported: unknown package manager"
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exit 1
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fi
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echo "Package manager: ${PM}"
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```
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## Check if root
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This exits with and error message if it's run as root.
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```bash
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#!/bin/bash
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if [ $(whoami) != "root" ]; then
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>&2 echo Rerun as non-root user
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exit 1
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fi
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```
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