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I tried this:
file="myfile" while read -r line do [[ $line = \#* ]] && continue "address=\$line\127.0.0.1" done < "$file" This code doesn't avoid the lines that begin with comments. Even if I don't have any comments, dnsmasq tells that there are errors.
Its going to be a dnsmasq conf file, and it will read and insert domain names like so: address=\mydomain.com\127.0.0.1.
Input file:
domain1.com domain2.com domain3.com #domain4.com domain5.com Output should be:
address=/domain1.com/127.0.0.1 address=/domain2.com/127.0.0.1 address=/domain3.com/127.0.0.1 address=/domain5.com/127.0.0.1 I will drop the script in /etc/dnsmasq.d/ directory so that dnsmaq.conf can process it when dnsmasq is started.
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Syntax: Read file line by line on a Bash Unix & Linux shell file. The -r option passed to read command prevents backslash escapes from being interpreted. Add IFS= option before read command to prevent leading/trailing whitespace from being trimmed. while IFS= read -r line; do COMMAND_on $line; done < input.
If you want to read each line of a file by omitting backslash escape then you have to use '-r' option with read command in while loop. Create a file named company2. txt with backslash and run the following command to execute the script. The output will show the file content without any backslash.
The while read loop. Here, cat reads each line from standard input and writes the line to standard output. It continues until the end-of-file condition is reached on file1, then it stops. In shell programming, we can read a line from standard input using the read command.
To skip lines starting with #:
grep -v '^#' myfile | while read -r file ; do ... done Modify the grep command as needed to, for example, skip lines starting with whitespace and a # character.
197
It's safer to use [[ "$line" = "\#*" ]]
Btw, address="\\${line}\\127.0.0.1"
UPD:
If I've understand you right you need to change every uncommented domains to address=\domain\127.0.0.1. It could be done fast and easy with sed, there is no need in bash-program.
$> cat ./text domain1.com domain2.com domain3.com #domain4.com domain5.com $> sed -r -e 's/(^[^#]*$)/address=\/\1\/127.0.0.1/g' ./text2 address=/domain1.com/127.0.0.1 address=/domain2.com/127.0.0.1 address=/domain3.com/127.0.0.1 #domain4.com address=/domain5.com/127.0.0.1 If you need to remove commented lines, sed can do it too with /matched_line/d
$> sed -r -e 's/(^[^#]*$)/address=\/\1\/127.0.0.1/g; /^#.*$/d' ./text2 address=/domain1.com/127.0.0.1 address=/domain2.com/127.0.0.1 address=/domain3.com/127.0.0.1 address=/domain5.com/127.0.0.1 UPD2: if you want to do all that stuff inside the bash script, here is your code modification:
file="./text2" while read -r line; do [[ "$line" =~ ^#.*$ ]] && continue echo "address=/${line}/127.0.0.1" done < "$file" And it's output:
address=/domain1.com/127.0.0.1 address=/domain2.com/127.0.0.1 address=/domain3.com/127.0.0.1 address=/domain5.com/127.0.0.1 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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