用sed -e '1,N d;M q'你将打印从N+1到M的行，这可能比grep -C更好一点，因为它不会尝试将行与模式匹配。

# print line number 52
sed -n '52p' # method 1
sed '52!d' # method 2
sed '52q;d' # method 3,  efficient on large files 

方法3对大文件有效

显示特定线条的最快方式

打印行5

sed -n '5p' file.txt
sed '5q' file.txt

打印第5行以外的所有内容

`sed '5d' file.txt

我用谷歌创建的

#!/bin/bash
#removeline.sh
#remove deleting it comes move line xD

usage() {                                 # Function: Print a help message.
  echo "Usage: $0 -l LINENUMBER -i INPUTFILE [ -o OUTPUTFILE ]"
  echo "line is removed from INPUTFILE"
  echo "line is appended to OUTPUTFILE"
}
exit_abnormal() {                         # Function: Exit with error.
  usage
  exit 1
}

while getopts l:i:o:b flag
do
    case "${flag}" in
        l) line=${OPTARG};;
        i) input=${OPTARG};;
        o) output=${OPTARG};;
    esac
done

if [ -f tmp ]; then
echo "Temp file:tmp exist. delete it yourself :)"
exit
fi

if [ -f "$input" ]; then
   re_isanum='^[0-9]+$'
   if ! [[ $line =~ $re_isanum ]] ; then
      echo "Error: LINENUMBER must be a positive, whole number."
      exit 1
   elif [ $line -eq "0" ]; then
      echo "Error: LINENUMBER must be greater than zero."
      exit_abnormal
   fi
   if [ ! -z $output ]; then
      sed -n "${line}p" $input >> $output
   fi
   if [ ! -z $input ]; then
      # remove this sed command and this comes move line to other file
      sed "${line}d" $input > tmp && cp tmp $input
   fi
fi

if [ -f tmp ]; then
rm tmp
fi

不，没有，文件不是行寻址的。

在文本文件中，没有固定时间的方法来找到第n行的开始。您必须流遍文件并计算换行符。

使用你拥有的最简单/最快的工具来完成这项工作。对我来说，使用head比使用grep更有意义，因为后者要复杂得多。我并不是说“grep很慢”，它确实不是，但是如果它比head更快，我会感到惊讶。那基本上就是脑袋里的虫子了。

我发现了其他两个解决方案，如果你知道行号，但没有其他(没有grep可能):

假设你需要第20到40行，

sed -n '20,40p;41q' file_name

or

awk 'FNR>=20 && FNR<=40' file_name

When using sed it is more efficient to quit processing after having printed the last line than continue processing until the end of the file. This is especially important in the case of large files and printing lines at the beginning. In order to do so, the sed command above introduces the instruction 41q in order to stop processing after line 41 because in the example we are interested in lines 20-40 only. You will need to change the 41 to whatever the last line you are interested in is, plus one.

我更喜欢更少的

输入50%到文件的一半， 43210G转到43210行 :43210来做同样的事情

诸如此类。

更好的方法是:点击v以在该位置开始编辑(当然是在vim中!)现在，请注意vim具有相同的键绑定!