Linux 查看由数字表示的文件的特定行
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view a particular line of a file denoted by a number
提问by XXL
Okay, this is probably an evident thing but it escapes me, as in it could probably be done in a much simpler way that I'm not aware of, so far.. Say there's a "file" and I want to view only what's on line number "X" of that file, what would be the solution?
好的，这可能是一件显而易见的事情，但它让我无法理解，因为到目前为止，它可能以一种我不知道的更简单的方式完成.. 假设有一个“文件”，我只想查看什么是在该文件的行号“X”上，解决方案是什么？
here's what i can think of:
这是我能想到的：
head -X < file | tail -1
sed -n Xp < file
is there anything else (or any other way) from the standard set of unix/gnu/linux text-tools/utils?
unix/gnu/linux text-tools/utils 的标准集还有什么（或任何其他方式）吗？
回答by pepoluan
awk one-liner:
awk 单行：
awk "NR==$X" file
bash loop:
bash循环：
for ((i=1; i<=X; i++)); do
read l
done < file
echo "$l"
回答by Jmoney38
sed -n 'Xp' theFile, where Xis your line number and theFileis your file.
sed -n 'Xp' theFile，X你的行号在哪里，theFile你的文件在哪里。
回答by Krrl
Just use vi
只需使用vi
vi file
When in the file type
当在文件类型
:X
where X is the line number you want to see
其中 X 是您要查看的行号
However, the sed -n Xp file is a good way if you really only want to see the one line
但是，如果您真的只想查看一行，sed -n Xp 文件是一个好方法
回答by Krrl
in vi:
在六：
vi +X filename
in EMACS:
在 EMACS 中：
emacs +X filename
in the shell:
在外壳中：
nl -ba -nln filename| grep '^X '
you can use context grep cgrep instead of grepto see some lines above and below the matching line..
您可以使用上下文 grep cgrep 而不是grep查看匹配行上方和下方的一些行。
EXAMPLES:
例子：
print just that one line:
只打印那一行：
$ nl -ba -nln active_record.rb | grep '^111 '
111 module ConnectionAdapters
with context:
有上下文：
$ nl -ba -nln active_record.rb | grep -C 2 '^111 '
109 end
110
111 module ConnectionAdapters
112 extend ActiveSupport::Autoload
113
for context control in grepcheck man grep:
grep检查上下文控制man grep：
Context Line Control
-A NUM, --after-context=NUM
Print NUM lines of trailing context after matching lines. Places a line containing a group separator (--) between contiguous groups of matches. With the -o or --only-matching option, this has no effect and a warning is given.
-B NUM, --before-context=NUM
Print NUM lines of leading context before matching lines. Places a line containing a group separator (--) between contiguous groups of matches. With the -o or --only-matching option, this has no effect and a warning is given.
-C NUM, -NUM, --context=NUM
Print NUM lines of output context. Places a line containing a group separator (--) between contiguous groups of matches. With the -o or --only-matching option, this has no effect and a warning is given.
