使用sed，我想替换文件中的字符串值

Question

cat input2.txt

Output:

    'enable_lb': True,
    'enable_firewall': True,
    'enable_vpn': True,

I tried

sed "s/^*.enable_firewall.*/    'enable_firewall': False,/" input2.txt

It's not changing the value of firewall to false, please help me out in this syntax

Thanks in Advance

Answer 1

You need to put . before the * , so that it would match any char zero or more times.

sed "s/^.*enable_firewall.*/    'enable_firewall': False,/" input2.txt

To do an in-place edit, add -i parameter.

sed -i "s/^.*enable_firewall.*/    'enable_firewall': False,/" input2.txt

Answer 2

To be more precise:

sed "s/\('enable_firewall': \)True/\1False/g" file

This matches exactly 'enable_firewall': True

Or:

sed "s/\('enable_firewall':.*\)True/\1False/g" file

This matches enable_firewall':*True * means anything

Or:

sed "s/\('enable_firewall':[ \t]*\)True/\1False/g" file1

This matches 'enable_firewall': True with zero or more spaces or tabs between : and True . If at least one space is a must, use [ \\t]\\+ instead of [ \\t]*

Note: use sed -i ... to replace inplace in file