history delete particular lines
My answer is based on previous answers, but with the addition of reversing the sequence so that history items are deleted from most recent to least recent.
Get your current history (adjust the number of lines you want to see):
history | tail -n 10
This gives me something like
1003 25-04-2016 17:54:52 echo "Command 1"
1004 25-04-2016 17:54:54 echo "Command 2"
1005 25-04-2016 17:54:57 echo "Command 3"
1006 25-04-2016 17:54:59 echo "Command 4"
1007 25-04-2016 17:55:01 echo "Command 5"
1008 25-04-2016 17:55:03 echo "Command 6"
1009 25-04-2016 17:55:07 echo "Command 7"
1010 25-04-2016 17:55:09 echo "Command 8"
1011 25-04-2016 17:55:11 echo "Command 9"
1012 25-04-2016 17:55:14 echo "Command 10"
Select the start and end positions for the items you want to delete. I'm going to delete entries 1006 to 1008.
for h in $(seq 1006 1008 | tac); do history -d $h; done
This will generate
history -d
commands for 1008 then 1007 then 1006.
If I also wanted to delete the history delete command then it's a bit more complicated because you need to know the current max history entry.
You can get this with (there may be a better way):
history | tail -1 | awk '{print $1}'
Putting it together you can use this to delete a range, and also delete the history delete command:
for h in $(seq 1006 1008 | tac); do history -d $h; done; history -d $(history | tail -1 | awk '{print $1}')
Wrap this all up in a function to add to your
~/.bashrc
:histdel(){
for h in $(seq $1 $2 | tac); do
history -d $h
done
history -d $(history | tail -1 | awk '{print $1}')
}
Example deleting command 4, 5 and 6 (1049-1051) and hiding the evidence:
[18:21:02 jonathag@gb-slo-svb-0221 ~]$ history | tail -n 11
1046 25-04-2016 18:20:47 echo "Command 1"
1047 25-04-2016 18:20:48 echo "Command 2"
1048 25-04-2016 18:20:50 echo "Command 3"
1049 25-04-2016 18:20:51 echo "Command 4"
1050 25-04-2016 18:20:53 echo "Command 5"
1051 25-04-2016 18:20:54 echo "Command 6"
1052 25-04-2016 18:20:56 echo "Command 7"
1053 25-04-2016 18:20:57 echo "Command 8"
1054 25-04-2016 18:21:00 echo "Command 9"
1055 25-04-2016 18:21:02 echo "Command 10"
1056 25-04-2016 18:21:07 history | tail -n 11
[18:21:07 jonathag@gb-slo-svb-0221 ~]$ histdel 1049 1051
[18:21:23 jonathag@gb-slo-svb-0221 ~]$ history | tail -n 8
1046 25-04-2016 18:20:47 echo "Command 1"
1047 25-04-2016 18:20:48 echo "Command 2"
1048 25-04-2016 18:20:50 echo "Command 3"
1049 25-04-2016 18:20:56 echo "Command 7"
1050 25-04-2016 18:20:57 echo "Command 8"
1051 25-04-2016 18:21:00 echo "Command 9"
1052 25-04-2016 18:21:02 echo "Command 10"
1053 25-04-2016 18:21:07 history | tail -n 11
The question was actually to delete the last 10 commands from history, so if you want to save a little effort you could use another function to call the
histdel
function which does the calculations for you.histdeln(){
# Get the current history number
n=$(history | tail -1 | awk '{print $1}')
# Call histdel with the appropriate range
histdel $(( $n - $1 )) $(( $n - 1 ))
}
This function takes 1 argument, the number of previous history items to delete. So to delete the last 10 commands from history just use
histdeln 10
.
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