bash 在shell中提取两个行号之间的行
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Extract lines between two line numbers in shell
提问by HobbitOfShire
How is this possible in shell using sedor any other filter
这怎么可能在 shell 中使用sed或任何其他过滤器
Lets say that i have two specific line numbers in two variables $line1and $line2and i want to extract lines between these two lines like this
假设我在两个变量中有两个特定的行号$line1，$line2并且我想像这样提取这两行之间的行
cat my_file_path | command $line1 $line2
Example if my file is:
例如，如果我的文件是：
1:bbb
1:bb
2:cccc
2:cccc
3:dddd
3:dddd
4:eeeee
4:eeee
My output should be if i do:
如果我这样做，我的输出应该是：
cat my_file_path | command 1 3
Output
输出
bbb
cccc
采纳答案by Kent
without testing:
未经测试：
awk -v s="$line1" -v e="$line2" 'NR>s&&NR<e' file
you can control the "inclusive/exclusive" with >= or <=
你可以控制“包含/独占” >= or <=
if you want to make it safe for leading/trailing spaces in your shell var:
如果您想让 shell var 中的前导/尾随空格安全：
awk -v s="$line1" -v e="$line2" 'NR>1*s&&NR<1*e' file
回答by Mihai
Using sed:
使用 sed：
$ cat my_file_path | sed -n "${line1},${line2}p"
or, even better (catis somehow redundant):
或者，甚至更好（cat在某种程度上是多余的）：
$ sed -n "${line1},${line2}p" my_file_path
回答by user1699917
You can use a pipe with tail and head
您可以使用带有尾部和头部的管道
tail -n +$line1 | head -n $((line2-line1))
回答by Enrique Palacio
This is what I use on Centos, this example print lines between 100 and 200 from myFile.log
这是我在 Centos 上使用的，此示例从myFile.log打印 100 到 200 之间的行
awk 'NR >= 100 && NR <= 200' myFile.log
Other example lines before 100
100 之前的其他示例行
awk 'NR <= 100' fileName.log
Note that You can also use >,< comparators.
请注意，您还可以使用 >,< 比较器。
This answer use NR variable aka record number, like line number, for more complex scenarios You can take a look to AWK build in variables: https://www.thegeekstuff.com/2010/01/8-powerful-awk-built-in-variables-fs-ofs-rs-ors-nr-nf-filename-fnr/
对于更复杂的场景，此答案使用 NR 变量又名记录号，例如行号您可以查看 AWK 内置变量：https: //www.thegeekstuff.com/2010/01/8-powerful-awk-built- in-variables-fs-ofs-rs-ors-nr-nf-filename-fnr/
hope It helps
希望能帮助到你
回答by Robin A. Meade
Using awk:
使用 awk：
awk 'NR==100, NR==200' myfile.log
awk 'NR==100, NR==200; NR==200 {exit}' myfile.log # optimized
The 2nd has the optimization that it exits after the last line of the desired range has been printed.
第二个优化是在打印完所需范围的最后一行后退出。
A range patternwas used:
使用了范围模式：
A range pattern is made of two patterns separated by a comma, in the form ‘begpat, endpat'. It is used to match ranges of consecutive input records.
https://www.gnu.org/software/gawk/manual/html_node/Ranges.html
范围模式由两个由逗号分隔的模式组成，格式为“begpat, endpat”。它用于匹配连续输入记录的范围。
https://www.gnu.org/software/gawk/manual/html_node/Ranges.html
A patterncan be either a regexp patternor an expression pattern. Above uses expression patternsto do comparisons with NR.
甲图案可以是正规表达式或表达模式。以上使用表达模式与 NR 进行比较。
