问题描述
我正在使用exiftool处理shell脚本，以自动更改某些文件夹中包含的图片上的一些exif标签，并且我想使用输出在作业完成时在NAS(QNAP)上获得通知.
I am working on a shell script with exiftool to automatically change some exif tags on pictures contained in a certain folder and I would like to use the output to get a notification on my NAS (a QNAP) when the job is completed.
一切正常，但是-通知系统截断消息时-我只想接收所需的信息，即shell输出的最后一行，例如:
Everything works already, but - as the notification system truncates the message - I would like to receive just the information I need, i.e. the last line of the shell output, which is for example the following:
Warning: [minor] Entries in IFD0 were out of sequence. Fixed. - 2015-07-12 15.41.06.jpg
4512 files failed condition
177 image files updated
问题是当前我仅收到以下通知:
The problem is that currently I only receive the following notification:
我想得到的是:
脚本如下:
#!/bin/sh
# exiftool script for 2002 problem
dir="/share/Multimedia/Camera"
cd "$dir"
FOLDER="$(printf '%s\n' "${PWD##*/}")"
OUTPUT="$(exiftool -overwrite_original -r '-CreateDate<DateTimeOriginal' -if '$CreateDate eq "2002:12:08 12:00:00"' -if '$DateTimeOriginal ne $CreateDate' *.[Jj][Pp][Gg])"
/sbin/notice_log_tool -a "Exiftool cronjob completed on ${FOLDER}: ${OUTPUT}" --severity=5
exit 0
要使用$ OUTPUT变量，请使用|尾-1，但可能我犯了一些基本错误，并且收到类似以下内容的信息:
To do that I played with the $OUTPUT variable using | tail -1, but probably I make some basic errors and I receive something like:
如何以正确的方式做到这一点?谢谢
How to do it in the right way? Thanks
推荐答案
将尾巴放在捕获对象的内部.
Put the tail inside the capturing parens.
OUTPUT=$(exif ... | tail -1)
这里不需要双引号.我猜你尝试过
You don't need the double quotes here. I'm guessing that youtried
OUTPUT="$(exif ...) | tail -1"
这篇关于获取外壳输出的最后一行作为变量的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！