在 linux 如何替换文件中模式内的子模式

In linux how to replace a sub pattern inside a pattern in a file

我想更改一个文件,read_write.c的内容

SYSCALL_DEFINE1(lchown, const char __user *, filename, uid_t, user)
SYSCALL_DEFINE2(open, const char __user *, filename, int)

SYSCALL_DEFINE1(lchown, const char __user *, filename, uid_t, user)
SYSCALL_DEFINE2(open, const unsigned char __user*, filename, int)

即我只想更改 SYSCALL_DEFINE2 内的参数,而不是 SYSCALL_DEFINE1

内的参数

使用 GNU sed:

sed '/SYSCALL_DEFINE2(/,/)/{s/const char __user \*/const unsigned char __user\*/}' file

从包含 SYSCALL_DEFINE2( 的行到包含 ) 的行,这会将 const char __user * 替换为 const unsigned char __user*

输出:

SYSCALL_DEFINE1(lchown, const char __user *, filename, uid_t, user)
SYSCALL_DEFINE2(open, const unsigned char __user*, filename, int)

查看 man sed 并搜索 addresses