unix-head

PowerShell equivalent for “head -n-3”?

由 元气小坏坏 提交于 2020-04-08 01:31:48
问题 I've been able to track down basic head/tail functionality: head -10 myfile <==> cat myfile | select -first 10 tail -10 myfile <==> cat myfile | select -last 10 But if I want to list all lines except the last three or all lines except the first three, how do you do that? In Unix, I could do "head -n-3" or "tail -n+4". It is not obvious how this should be done for PowerShell. 回答1: Like the -First and -Last parameters, there is also a -Skip parameter that will help. It is worth noting that

How do I use Head and Tail to print specific lines of a file

由 血红的双手。 提交于 2019-12-12 09:31:40
问题 I want to say output lines 5 - 10 of a file, as arguments passed in. How could I use head and tail to do this? where firstline = $2 and lastline = $3 and filename = $1 . Running it should look like this: ./lines.sh filename firstline lastline 回答1: Aside from the answers given by fedorqui and Kent, you can also use a single sed command: #! /bin/sh filename=$1 firstline=$2 lastline=$3 # Basics of sed: # 1. sed commands have a matching part and a command part. # 2. The matching part matches

How do I use Head and Tail to print specific lines of a file

由 坚强是说给别人听的谎言 提交于 2019-12-04 23:42:03
I want to say output lines 5 - 10 of a file, as arguments passed in. How could I use head and tail to do this? where firstline = $2 and lastline = $3 and filename = $1 . Running it should look like this: ./lines.sh filename firstline lastline sfstewman Aside from the answers given by fedorqui and Kent , you can also use a single sed command: #! /bin/sh filename=$1 firstline=$2 lastline=$3 # Basics of sed: # 1. sed commands have a matching part and a command part. # 2. The matching part matches lines, generally by number or regular expression. # 3. The command part executes a command on that

How do I get java to exit when piped to head

由 安稳与你 提交于 2019-11-29 11:28:16
问题 I have a java process which prints out a lot of text. Sometimes I just want to see a bit of the text. With normal programs I can just do: $ myprog | head I'll just see 10 lines of output from myprog and it will exit immediately. But with java, if I do: $ java MyClass | head I get the first 10 lines of output, but the java process won't exit until it's done with all of its processing. It's like java doesn't care that stdout (System.out) is gone and the head process is dead and gone. All other

What's the opposite of head? I want all but the first N lines of a file

由 ￣綄美尐妖づ 提交于 2019-11-28 04:01:44
Given a text file of unknown length, how can I read, for example all but the first 2 lines of the file? I know tail will give me the last N lines, but I don't know what N is ahead of time. So for a file AAAA BBBB CCCC DDDD EEEE I want CCCC DDDD EEEE And for a file AAAA BBBB CCCC I'd get just CCCC Joe Enos tail --help gives the following: -n, --lines=K output the last K lines, instead of the last 10; or use -n +K to output lines starting with the Kth So to filter out the first 2 lines, -n +3 should give you the output you are looking for (start from 3rd). Mike DeMaria Assuming your version of

What's the opposite of head? I want all but the first N lines of a file

由 独自空忆成欢 提交于 2019-11-27 05:15:55
问题 Given a text file of unknown length, how can I read, for example all but the first 2 lines of the file? I know tail will give me the last N lines, but I don't know what N is ahead of time. So for a file AAAA BBBB CCCC DDDD EEEE I want CCCC DDDD EEEE And for a file AAAA BBBB CCCC I'd get just CCCC 回答1: tail --help gives the following: -n, --lines=K output the last K lines, instead of the last 10; or use -n +K to output lines starting with the Kth So to filter out the first 2 lines, -n +3
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