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运行时命令的每个输出的前缀

tag-icon • tag-icon linux command-line bash shell bash-scripting
运行时命令的每个输出的前缀

我正在尝试制作一个模块化脚本。我有几个脚本/命令，它们从单个脚本调用。
我想为每个单独的命令的输出添加前缀。

例如：

我的文件是所有命令.sh / 命令1.sh / 命令2.sh

命令1.sh输出
file exists
file moved

命令2.sh输出
file copied
file emptied

所有命令运行脚本命令1.sh和命令2.sh

我想给这两个脚本的每个输出添加前缀，如下所示：
[command1] file exists
[command1] file moved
[command2] file copied
[command2] file emptied

答案1

我假设您在 allcommands.sh 中执行的操作是：

command1.sh
command2.sh

只需将其替换为

command1.sh | sed "s/^/[command1] /"
command2.sh | sed "s/^/[command2] /"

答案2

一个最小的例子allcommands.sh：

#!/bin/bash
for i in command{1,2}.sh; do
    ./"$i" | sed 's/^/['"${i%.sh}"'] /'
done

使用command1.sh可执行command2.sh文件并在同一目录中echo输入所需的字符串，这将给出 shell 输出：

$ ./command1.sh 
file exists
file moved
$ ./command2.sh 
file copied
file emptied
$ ./allcommands.sh 
[command1] file exists
[command1] file moved
[command2] file copied
[command2] file emptied

快速sed分解

sed 's/^/['"${i%.sh}"'] /'
  • s/进入“正则表达式模式匹配和替换”模式
  • ^/表示“匹配每一行的开头”
  • ${i%.sh}发生在 shell 上下文中，意思是“ $i，但去掉后缀.sh”
  • ['"${i%.sh}"'] /首先打印一个[，然后退出引用的上下文以$i从 shell 中获取变量，然后重新进入以和]一个空格结束。

答案3

简单示例：

#!/usr/bin/env bash
# allcommands.sh

output-prefix() {
  local title="${1/\.[a-zA-Z.0-9-_]*/}"
  title="${title/[.-\/_a-zA-Z0-9]*\//}"
  "$@" \
    2> >(sed "s/^/[$title] [ERR] /" >&2) \
    > >(sed "s/^/[$title] [INF] /")
}

output-prefix ./command1.sh
# [command1] [INF] file exists
# [command1] [INF] file moved

output-prefix ./command2.sh
# [command2] [INF] file copied
# [command2] [INF] file emptied

以时间戳作为函数/脚本的前缀：

#!/usr/bin/env bash

output-prefix() {
  local title="$1" ; shift
  "$@" \
    2> >(sed "s/^/$(date '+%Y-%m-%d %H:%M:%S') [ERR] {$title} /" >&2) \
    > >(sed "s/^/$(date '+%Y-%m-%d %H:%M:%S') [INF] {$title} /")
}

output-prefix command1 ./command1.sh arg1
# 2023-04-29 17:37:12 [INF] {command1} arg1
# 2023-04-29 17:37:12 [ERR] {command1} test as errout

output-prefix command2 ./command2.sh argB
# 2023-04-29 17:37:12 [INF] {command2} argB
# 2023-04-29 17:37:12 [ERR] {command2} argB as errout

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