bash 如何通过命令行将变量文本附加到文件的最后一行？
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How can I append a variable text to last line of file via command line?
提问by Martin Thoma
could you please tell me how I (a Linux-User) can add text to the last line of a text-file?
你能告诉我我（一个 Linux 用户）如何将文本添加到文本文件的最后一行吗？
I have this so far:
到目前为止我有这个：
APPEND='Some/Path which is/variable'
sed '${s/$/$APPEND/}' test.txt
It works, but $APPEND is added insted of the content of the variable. I know the reason for this is the singe quote (') I used for sed. But when I simply replace ' by ", no text gets added to the file.
它有效，但 $APPEND 被添加到变量的内容中。我知道这样做的原因是我用于 sed 的单引号 (')。但是当我简单地将 ' 替换为 " 时，文件中不会添加任何文本。
Do you know a solution for this? I don't insist on using sed, it's only the first command line tool that came in my mind. You may use every standard command line program you like.
你知道解决这个问题的方法吗？我不坚持使用sed，它只是我想到的第一个命令行工具。您可以使用您喜欢的每个标准命令行程序。
edit: I've just tried this:
编辑：我刚刚试过这个：
$ sed '${s/$/'"$APPEND/}" test.txt
sed: -e Ausdruck #1, Zeichen 11: Unbekannte Option für `s'
回答by Martin Thoma
echo "$(cat $FILE)$APPEND" > $FILE
This was what I needed.
这正是我所需要的。
回答by SingleNegationElimination
The simplest way to append data is with file redirection.
追加数据的最简单方法是使用文件重定向。
echo $APPEND >>test.txt
回答by Fredrik Pihl
Using this as input:
使用它作为输入：
1 a line
2 another line
3 one more
and this bash-script:
和这个 bash 脚本：
#!/bin/bash
APPEND='42 is the answer'
sed "s|$|${APPEND}|" input
outputs:
输出：
1 a line42 is the answer
2 another line42 is the answer
3 one more42 is the answer
Solution using awk:
使用awk的解决方法：
BEGIN {s="42 is the answer"}
{lines[NR]=sed '${s/$/'"$APPEND"'/}' test.txt
}
END {
for (i = 1; i < NR; i++)
print lines[i]
print lines[NR], s
}
回答by ToonZ
(
set -xv
APPEND=" word"
echo '
1
2
3' |
sed '${s/$/'"${APPEND}"'/;}'
#sed "${s/$/${APPEND}/;}"
)
回答by Hyman
Add a semicolon after the sed substitution command!
在 sed 替换命令后添加分号！
##代码##