i am trying to replace 2 variables with / in-between 2 variables but its giving sed expression -e error
我试图用2个变量替换2个变量，但是它给出了sed表达式-e error
sed 's/'$presentnetwork'/'$netmask\/$subnet'/g' -i /etc/snmp/snmpd.conf
How to put the / and also substitute a variable using sed even if i try to put only one variable it is also not working
如何使用/并使用sed替换变量，即使我尝试只放置一个变量也不起作用
sed 's/'$presentnetwork'/'$netmask\/'/g' -i /etc/snmp/snmpd.conf
Is it possible to use escape sequence and variable in the same sed command?
是否可以在同一个sed命令中使用转义序列和变量？
2 个解决方案
#1
2
You need to wrap it with double quotes ":
你需要用双引号“包装它”：
sed "s/$presentnetwork/$netmask\//g" -i /etc/snmp/snmpd.conf
# ^ ^
Example:
$ cat a.html
hello
$ a=hello
$ b=good
$ c=bye
$ sed "s/$a/$b\/$c/g" -i a.html
$ cat a.html
good/bye
#2
1
sed isn't limited to / as delimiter, you can also use some other character to make escaping easier (if you know the character can't be part of your variable):
sed不限于/作为分隔符，你也可以使用其他一些字符来简化转义（如果你知道字符不能成为变量的一部分）：
sed "s_$presentnetwork_$netmask/_g" -i /etc/snmp/snmpd.conf
#1
2
You need to wrap it with double quotes ":
你需要用双引号“包装它”：
sed "s/$presentnetwork/$netmask\//g" -i /etc/snmp/snmpd.conf
# ^ ^
Example:
$ cat a.html
hello
$ a=hello
$ b=good
$ c=bye
$ sed "s/$a/$b\/$c/g" -i a.html
$ cat a.html
good/bye
#2
1
sed isn't limited to / as delimiter, you can also use some other character to make escaping easier (if you know the character can't be part of your variable):
sed不限于/作为分隔符，你也可以使用其他一些字符来简化转义（如果你知道字符不能成为变量的一部分）：
sed "s_$presentnetwork_$netmask/_g" -i /etc/snmp/snmpd.conf