bash – 在文件中第一次出现特定字符串之前删除所有行

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.}

_{d Delete the pattern space; immediately start next cycle.}

结果：

$sed -i '/somestring/,$!d' file
somestring
bats
car
somestring
bats
car
somestring
bats
car