基本上我有一个像这样的文件：
junk morejunk somestring bats car somestring bats car somestring bats car
我想在第一次出现somestring之前删除所有垃圾,以便文件看起来像
somestring bats car somestring bats car somestring bats car
我按照this question的建议使用sed -i’0,/ somestring /,d’file.txt,但是当我想将该行保留为第一行时,它会删除第一次出现somestring的行.
使用sed你可以使用：
sed -i '/somestring/,$!d' file
替换表达式的说明：
,matches lines starting from where the first
address matches,and continues until the second match
(inclusively).
$matches the last line of the last file of input,
or the last line of each file when the -i or -s options are
specified.
!If the character follows an address range,then only lines
which do not match the address range will be selected.
dDelete the pattern space; immediately start next cycle.
结果：
$sed -i '/somestring/,$!d' file somestring bats car somestring bats car somestring bats car
