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sed add line to config file

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# 1  
Old 03-01-2018
sed add line to config file
what is the sed command line to add a line to a config file

config file name is "config"

line to be added

cpuid.7.edx = "----:00--:----:----:----:----:----:----"


thanks
# 2  
Old 03-01-2018
use acho and append >>
# 3  
Old 03-01-2018
gnu?
Code:
sed -i '$ a cpuid.7.edx = "----:00--:----:----:----:----:----:----"' config

# 4  
Old 03-01-2018
You can use this "replace_append" script:
Code:
#!/bin/sh
searchkey=$1
shift
sep=$1
shift
replaceval=$1
shift
sed '
# look for the searchkey
  /^'"$searchkey$sep"'/ {
# replace the value
    s#'"$sep"'.*#'"$sep$replaceval"'#
# copy the rest of the file
    :L
    n
    bL
  }
# not found? Append a line
  $a\
'"$searchkey$sep$replaceval"'
' "$@"

And run it with
Code:
./replace_append "puid.7.edx" " = " '"----:00--:----:----:----:----:----:----"' config > config.new

If config.new looks good then copy it back to config.

The script looks for the key, if it matches then it changes the value.
If it does not find the key then it appends a line.

If you have GNU sed then you can add a -i.bak option to sed in the script. Then sed will modify the original file and leave a .bak file. (And you don't need to redirect the output.)
# 5  
Old 03-01-2018
Quote:
Originally Posted by tdubb123
what is the sed command line to add a line to a config file

config file name is "config"

line to be added

cpuid.7.edx = "----:00--:----:----:----:----:----:----"


thanks
If all you need is to append, sed is not necessary.
If you need to insert, before or after a specific line, sed is not necessary.
If you need to insert before or after an specific pattern in a line, you could use sed, but other ways might work better.

Could you post an example representation of your desired output?
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