使用预设系统信息替换uname

uname-static.sh

#!/bin/bash

# 系统信息预设
KERNEL_NAME="Linux"
NODENAME="$(hostname 2>/dev/null || echo 'localhost.localdomain')"
KERNEL_RELEASE="3.10.0-957.el7.x86_64"
KERNEL_VERSION="#1 SMP Thu Nov 8 23:39:32 UTC 2018"
MACHINE="x86_64"
PROCESSOR="x86_64"
HARDWARE_PLATFORM="x86_64"
OPERATING_SYSTEM="GNU/Linux"

# 辅助函数前置定义
show_help() {
	cat <<EOF
Usage: uname [OPTION]...
Print certain system information.  With no OPTION, same as -s.

  -a, --all                print all information, in the following order,
                             except omit -p and -i if unknown:
  -s, --kernel-name        print the kernel name
  -n, --nodename           print the network node hostname
  -r, --kernel-release     print the kernel release
  -v, --kernel-version     print the kernel version
  -m, --machine            print the machine hardware name
  -p, --processor          print the processor type or "unknown"
  -i, --hardware-platform  print the hardware platform or "unknown"
  -o, --operating-system   print the operating system
      --help     display this help and exit
      --version  output version information and exit

GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
For complete documentation, run: info coreutils 'uname invocation'
EOF
}

show_version() {
	cat <<EOF
uname (GNU coreutils) 8.22
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by David MacKenzie.
EOF
}

# 选项标志声明
declare -A flags=(
	[s]=0 [n]=0 [r]=0 [v]=0
	[m]=0 [p]=0 [i]=0 [o]=0
)
show_all=false

# 标准化参数解析
while getopts ":asnrvmpio-:" opt; do
	case $opt in
	a) show_all=true ;;
	s) flags[s]=1 ;;
	n) flags[n]=1 ;;
	r) flags[r]=1 ;;
	v) flags[v]=1 ;;
	m) flags[m]=1 ;;
	p) flags[p]=1 ;;
	i) flags[i]=1 ;;
	o) flags[o]=1 ;;
	-) # 长选项处理
		case "${OPTARG}" in
		help)
			show_help
			exit 0
			;;
		version)
			show_version
			exit 0
			;;
		all) show_all=true ;;
		kernel-name) flags[s]=1 ;;
		nodename) flags[n]=1 ;;
		kernel-release) flags[r]=1 ;;
		kernel-version) flags[v]=1 ;;
		machine) flags[m]=1 ;;
		processor) flags[p]=1 ;;
		hardware-platform) flags[i]=1 ;;
		operating-system) flags[o]=1 ;;
		*)
			echo -e "uname: unrecognized option '--${OPTARG}'\nTry 'uname --help' for more information." >&2
			exit 1
			;;
		esac
		;;
	\?)
		echo -e "uname: invalid option -- '${OPTARG}'\nTry 'uname --help' for more information." >&2
		exit 1
		;;
	esac
done

# 处理显示逻辑
output=()
if $show_all; then
	# -a 的固定显示顺序
	output=(
		"$KERNEL_NAME"
		"$NODENAME"
		"$KERNEL_RELEASE"
		"$KERNEL_VERSION"
		"$MACHINE"
	)
	[[ "$PROCESSOR" != "unknown" ]] && output+=("$PROCESSOR")
	[[ "$HARDWARE_PLATFORM" != "unknown" ]] && output+=("$HARDWARE_PLATFORM")
	output+=("$OPERATING_SYSTEM")
else
	# 常规选项按固定顺序处理
	[[ ${flags[s]} -eq 1 ]] && output+=("$KERNEL_NAME")
	[[ ${flags[n]} -eq 1 ]] && output+=("$NODENAME")
	[[ ${flags[r]} -eq 1 ]] && output+=("$KERNEL_RELEASE")
	[[ ${flags[v]} -eq 1 ]] && output+=("$KERNEL_VERSION")
	[[ ${flags[m]} -eq 1 ]] && output+=("$MACHINE")
	[[ ${flags[p]} -eq 1 && "$PROCESSOR" != "unknown" ]] && output+=("$PROCESSOR")
	[[ ${flags[i]} -eq 1 && "$HARDWARE_PLATFORM" != "unknown" ]] && output+=("$HARDWARE_PLATFORM")
	[[ ${flags[o]} -eq 1 ]] && output+=("$OPERATING_SYSTEM")
fi

# 默认显示内核名称
[[ ${#output[@]} -eq 0 ]] && output=("$KERNEL_NAME")

# 格式化输出
echo "${output[*]}"

exit 0