shell脚本修改文件部分内容

Question

问题描述：想修改文件指定内容 但是行数过多 用sed感觉过于繁琐 有没有像echo一样直接追加到指定位置然后注释原有内容之类的方法？
感觉自己钻牛角尖了 没有想明白 求指教
随便截个代码片段做例子

 # for all of them.
LOCAL_PATH = '/tmp'
SECRET_KEY='e9c3b51c80a59a17ba8e'

# We recommend you use memcached for development; otherwise after every reload
# of the django development server, you will have to login again. To use
# memcached set CACHES to something like
#CACHES = {
#    'default': {
#        'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
#        'LOCATION': '127.0.0.1:11211',
#    }
#}

CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
    }
}

# Send email to the console by default
EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
# Or send them to /dev/null
#EMAIL_BACKEND = 'django.core.mail.backends.dummy.EmailBackend'

# Configure these for your outgoing email host
#EMAIL_HOST = 'smtp.my-company.com'
#EMAIL_PORT = 25
#EMAIL_HOST_USER = 'djangomail'
#EMAIL_HOST_PASSWORD = 'top-secret!'

# For multiple regions uncomment this configuration, and add (endpoint, title).
#AVAILABLE_REGIONS = [
#    ('http://cluster1.example.com:5000/v2.0', 'cluster1'),
#    ('http://cluster2.example.com:5000/v2.0', 'cluster2'),
#]

OPENSTACK_HOST = "127.0.0.1"
OPENSTACK_KEYSTONE_URL = "http://%s:5000/v2.0" % OPENSTACK_HOST
OPENSTACK_KEYSTONE_DEFAULT_ROLE = "_member_"

# Enables keystone web single-sign-on if set to True.
#WEBSSO_ENABLED = False

# Determines which authentication choice to show as default.
#WEBSSO_INITIAL_CHOICE = "credentials"





比如将下面内容

 CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
    }
}

# Send email to the console by default
EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
# Or send them to /dev/null
#EMAIL_BACKEND = 'django.core.mail.backends.dummy.EmailBackend'


修改为





   CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
            ‘localhost'：'127.0.0.1'
            '1111111':'22222'
        }
}

 Send email to the console by default
#EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'
 Or send them to /dev/null
EMAIL_BACKEND = 'django.core.mail.backends.dummy.EmailBackend'

Answer 1

你这个，通过SED命令，在指定行后面添加内容就行了呀。

在指定行后插入一行
sed '2 attt' -i a.txt #在第2行后插入ttt,并且将结果更新到a.txt（如果不想更新原文件，去掉-i）