Date: Fri, 3 Nov 2017 23:37:29 +1100 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: Polytropon <freebsd@edvax.de> Cc: byrnejb@harte-lyne.ca, freebsd-questions@freebsd.org Subject: Re: Reconstruct a bash_history file Message-ID: <20171103232233.P7397@sola.nimnet.asn.au> In-Reply-To: <mailman.75.1509710402.96436.freebsd-questions@freebsd.org> References: <mailman.75.1509710402.96436.freebsd-questions@freebsd.org>
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In freebsd-questions Digest, Vol 700, Issue 5, Message: 7
On Thu, 2 Nov 2017 21:46:34 +0100 Polytropon <freebsd@edvax.de> wrote:
> You need the YYYY-MM-DD HH:MM:SS timestamp to the Epoch format,
> prefix it with a #, and put the command on a new line.
>
> Maybe like this, if you don't mind a multiple-line one-liner
> of regular shell script:
>
> $ cat history.txt | while read LINE; do DATETIME=`echo $LINE | cut -d ':' -f 1-3`; TIMESTAMP=`date -j -f "%Y-%m-%d %H:%M:%S" "${DATETIME}" "+#%s"`; COMMAND=`echo $LINE | cut -d ':' -f 4-`; echo "${TIMESTAMP}"; echo "${COMMAND}" | sed "s/^ //"; done > bash_history.txt
>
> This version is easier to read:
>
> cat history.txt | while read LINE; do
> DATETIME=`echo $LINE | cut -d ':' -f 1-3`
> TIMESTAMP=`date -j -f "%Y-%m-%d %H:%M:%S" "${DATETIME}" "+#%s"`
> COMMAND=`echo $LINE | cut -d ':' -f 4-`
> echo "${TIMESTAMP}"
> echo "${COMMAND}" | sed "s/^ //"
> done > bash_history.txt
>
> It features the "useless use of cat" line the one-liner. ;-)
Nice work!
A most useful "useless use of cat", but even that could be avoided with:
while read LINE; do
[..]
done < history.txt > bash_history.txt
cheers, Ian
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