为 "echo" 输出文件创建时间戳

Question

我正在尝试为从下面的 .sh 文件生成的信息创建一个时间戳，当它是运行并且执行 "echo" 时。执行此操作的最佳方法是什么？

echo "Target File" >> /cygdrive/c/FilePath/Log.txt
if [ -f //TargetDirectory/TargetFile ]
then
    echo //TargetDirectory/TargetFile is present. >> /cygdrive/c/FilePath/Log.txt
else
    echo //TargetDirectory/TargetFile is missing. >> /cygdrive/c/FilePath/Log.txt
fi
echo -e "\n" >> /cygdrive/c/FilePath/Log.txt

Answer 1

echo () {
    builtin echo "$(date +'[%m-%d %H:%M:%S]'):" "$@"
}

只需覆盖 echo。

Answer 2

如果你想为你的脚本的所有输出（到 STDOUT）加上时间戳，而不仅仅是 echo:

产生的输出

#!/bin/bash

timestamp () {
    while read -r line
    do
        echo "$(date --iso-8601=ns) $line"
    done
}

exec > >(timestamp)

echo "Target File" >> /cygdrive/c/FilePath/Log.txt
if [ -f //TargetDirectory/TargetFile ]
then
    echo //TargetDirectory/TargetFile is present. >> /cygdrive/c/FilePath/Log.txt
else
    echo //TargetDirectory/TargetFile is missing. >> /cygdrive/c/FilePath/Log.txt
fi
echo -e "\n" >> /cygdrive/c/FilePath/Log.txt
printf '%s' "something"
whoami

如果您要分析脚本的执行情况，请参阅 my answer here。

Answer 3

我会写一个日志函数。

function log()
{
    echo "$(date +'[%m-%d %H:%M:%S]'):" $* >> /cygdrive/c/FilePath/Log.txt
}

log "Target File"
if [ -f //TargetDirectory/TargetFile ]
then
    log //TargetDirectory/TargetFile is present.
else
    log //TargetDirectory/TargetFile is missing.
fi
log -e "\n"

为 "echo" 输出文件创建时间戳

Creating timestamps for "echo" outputs to file

unix

linux

windows

bash

cygwin