linux - How to comment out only uncommented lines with Sed and leave blank/empty lines 100% intact? -
i’m putting bash configuration scripts configure linux server , able comment uncommented lines in file, leave blank/empty lines intact , untouched.
using the great answer question able come sed 1 liner works nicely:
sed -e '/^#/!s/\(.*\)/# \1/g' /etc/update-motd.d/90-updates-available
of course when run sed command on production setup -e
swapped -i
write file in place, anyway contents of file commented out shown below:
#!/bin/sh # # if [ -x /usr/lib/update-notifier/update-motd-updates-available ]; # exec /usr/lib/update-notifier/update-motd-updates-available # fi
but ideally have output this; note how 1 blank/empty line untouched.:
#!/bin/sh # if [ -x /usr/lib/update-notifier/update-motd-updates-available ]; # exec /usr/lib/update-notifier/update-motd-updates-available # fi
is there way in sed?
how this:
sed -e 's/^\([^#].*\)/# \1/g' /etc/update-motd.d/90-updates-available
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