I used the following command in the bash to remove the last two lines of bash.bashrc (I added some bad lines) : sed '69,70d' /etc/bash.bashrc
But it doesn't delete the lines permanently as I would like.
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Brian Tompsett - 汤莱恩
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Simon
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What OS are you on? Sed behaves differently in dofferent setups. – Giacomo1968 Jun 09 '14 at 01:31
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I'm using the last version of linuxlint – Simon Jun 09 '14 at 01:34
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Okay. Check out my answer. – Giacomo1968 Jun 09 '14 at 01:40
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`sed -i` : replaces in the file (and thus modifies the file). your `sed '69,70d' /etc/bashrc` just outputs the file minus lines 69,70. `sed -i '69,70d' /etc/bash.bashrc` would do that in (and thus modify) the file – Olivier Dulac Jun 09 '14 at 05:41
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This should work to remove the last two lines:
sed -n -e :a -e '1,2!{P;N;D;};N;ba' /etc/bash.bashrc
And then if you pipe it through | cat > /etc/bash.bashrc it will overwrite the file with the new shortened content:
sed -n -e :a -e '1,2!{P;N;D;};N;ba' /etc/bash.bashrc | cat > /etc/bash.bashrc
Giacomo1968
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Thank you for your response, but it doesn't seem to work. Are there no simpler way to do it? – Simon Jun 09 '14 at 01:42
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@user3683807 It could be that you need to run the command as `sudo`? So it would be `sudo sed -n -e :a -e '1,2!{P;N;D;};N;ba' /etc/bash.bashrc`. – Giacomo1968 Jun 09 '14 at 01:44
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One solution is using head -n -<n> in combination of tee.
Although head does not support in place edit which is supported in sed -i
, you can accomplish in place edit using tee command.
See: sed command find and replace in file and overwrite file doesn't work, it empties the file
head -n -2 /etc/bash.bashrc | sudo tee /etc/bash.bashrc >/dev/null
