问题描述

shell脚本修改文件部分内容

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 defaultEMAIL_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_HOSTOPENSTACK_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 defaultEMAIL_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/nullEMAIL_BACKEND = 'django.core.mail.backends.dummy.EmailBackend'

解决方案

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）

解决方案二：
用c修改文件中部分内容