History list without timestamp and unique the results
Solution 1
Simply, history | sed 's/.[ ]*.[0-9]*.[ ]*//' | uniq | grep -i "heroku"
the sed
will remove the any [spaces][numbers][spaces] at the start of each line
for optimization make it
history | grep -i "heroku" | sed 's/.[ ]*.[0-9]*.[ ]*//' | uniq
Solution 2
Addition to answer by @devav2
Clear/nullify the history timestamp environment variable
HISTTIMEFORMAT="";
Export the following command,
export HISTCONTROL=ignoredups
--> This will ignore the duplicates that are executed in sequence
Solution 3
The timestamp can be suppressed (or modified) on a per-command basis:
If the HISTTIMEFORMAT variable is set and not null, its value is used as a format string for strftime(3) to print the time stamp associated with each displayed history entry. No time stamps are printed otherwise.
That just leaves the line numbers, which can't be suppressed, but which are padded to a fixed width (for line numbers < 100,000):
printf("%5d%c %s%s\n", line_number, modified ? '*' : ' ', timestamp, line);
Thus, to remove the prefix from each line, we need to snip the first 7 characters (5 digits, 1 marker character, and 1 space) e.g.:
$ HISTTIMEFORMAT= history 10 | cut -c8-
This can easily be added to an alias:
$ alias h='HISTTIMEFORMAT= history | cut -c8-'
Then invoked with e.g.:
$ h | grep whatever
$ h | head -n 10
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justingordon
Updated on September 18, 2022Comments
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justingordon over 1 year
Using bash, I save my history with the timestamp.
How do print the history omitting the timestamp?
alias h=history alias g=grep -i
To find lines that I used for heroku, I type:
> h | g heroku
I'd like to unique the results without the time-stamp, naturally.
This question is somewhat related: How to avoid duplicate entries in .bash_history
However, sometimes I want to see the duplicate in the history to see the context under which a command was run.
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devav2 over 11 years
history | cut -d " " -f7-1000 | sort | uniq | grep heroku
try this out. -
justingordon over 11 yearsAwesome -- I was hoping that history had an option to do what the cut command does. Only issue with the above is that all entries get sorted alphabetically. I'd rather the results get sorted such that the most recently used commands are last, as I'm more likely to use more recently used commands.
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justingordon about 10 yearsignoredups makes up error work poorly, because if the recent command is further up in the list, it doesn't get added again.
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GC 13 about 10 years@justingordon, Yes, using above comment by devav2, I have just added few information useful towards it.
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GC 13 about 10 years@justingordon for your 1st commment, ignoredups will remove duplicates that are in sequence so if you want your history in timeline order, use following command
export HISTCONTROL=ignoredups
history | cut -d " " -f7-1000 | grep heroku further, if you want to see timestamp of a particular command, export HISTTIMEFORMAT=" %F %T " Hope this seems to be helpful -
justingordon about 10 yearsRaj, this does what I need: "history | cut -d " " -f7-1000 | sort | uniq | grep heroku", but the uniq command only removes duplicate lines adjacent. A simple program could substitute for sort | uniq and do the trick. Just wondering if there was a clever built-in way to do this.
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GC 13 about 10 years@justingordon sort command will break the relevance which can be useful for finding the context where a command was run.
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dc95 over 7 yearsTo make this work in TTY terminal, remove the space between
HISTTIMEFORMAT
and="";
i.e. runHISTTIMEFORMAT="";
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Zanna over 7 yearsthat will only take the history entry number - if there are actually timestamps like
2 2016-10-05 00:26:00 vim .bashrc
this is not going to remove them.