Using history command in bash script

[Johnny Rosenberg]

2012/2/24 Bert Swart <bertswart at chello.nl>:
> On Fri, Feb 24, 2012 at 01:59:39PM +0100, Johnny Rosenberg wrote:
>> Den 24 februari 2012 13:12 skrev Johnny Rosenberg <gurus.knugum at gmail.com>:
>> > Seems not to be possible.
>> >
>> > ~$ cat > pa
>> > #!/bin/bash
>> >
>> > history
>> > history
>> > history
>> > <Ctrl+d>
>> > ~$ chmod +x pa
>> > ~$ pa
>> > ~$
>> >
>> > So there seem to be no history entries available when I run history
>> > from a bash script. Why is this?
>> >
>> > I also tried to use the ~/.bash_history file, but it doesn't seem like
>> > events are added to it for each command executed, since at least a
>> > couple of ten commands are missing at the end. Seems like things are
>> > added to the .bash_history file ”now and then”, I'm not sure how
>> > often. How can I get around this? Where are the latest history lines
>> > recorded before they are added to the actual .bash_history file?
>> >
>> > I'm trying to make a bash script that creates an alias for my last
>> > command and save it in my .bash-aliases file (which is launched from
>> > the .bashrc file), so I need some way to know what my latest command
>> > was.
>> >
>> >
>> > Kind regards
>> >
>> > Johnny Rosenberg
>> > ジョニー・ローゼンバーグ
>>
>> About that .bash_history file:
>> At the moment, my history is 620 entries. If I look in the
>> .bash_history file, the last command there match entry 527 of the
>> history command's output. Where are the 93 missing entries? Can I
>> force bash to write those to the .bash_history file?
> Yes, set history -a in your .bashrc

Failed.
All that did was to add entries to the .bash_history file when the
history -a command was run. After that, no more entries are added, at
least not for every time they are executed.

I also tried to run history -a from my shell script, but history seems
to be blocked in a bash script.



Kind regards

Johnny Rosenberg
ジョニー・ローゼンバーグ