i wrote the following program:

# !/bin/bash
#profile program
function histoire {
HISTSIZE=20
echo “HISTSIZE est égale à” $HISTSIZE
echo “le numéro de la commande est” $fc $-l
}
histoire
exit 0

can someone tell me, why am i not getting the same result, as in when i directly write the command fc -l ? and whats hBl ?

knoppix@knoppix:/ramdisk/home/knoppix/tmp$ chmod +x .profile
+ chmod +x .profile
knoppix@knoppix:/ramdisk/home/knoppix/tmp$ ./.profile
+ ./.profile
HISTSIZE est égale à 20
le numéro de la commande est hBl

where did you read that "$fc $-l" would do what you want? that means nothing.... try "$((fc -l))" instead.

well after trying $(fc -l )
the only thing that wouldnt give me errors was $fc$-l !!

i tried $((fc -l)), but that gives me 0, i want the same list that i get when i simply type fc -l on the xterm !

how can i do that? any idea ?

yeah it does doesn't it? retard alert.... i knew it didn't look right... sorry, it does basic expression evalution...

# echo $(( 10 + 10 ))

20

you do need $(fc -l) or `fc -l` to actually execute fc as a command. i don't think that that's really useful to you though as it'll print it all on one line... i'd just put the fc command on a new line by itself.



doh!

neither 'fc -l' nor $(fc -l) worked !
i already tried those two,
maybe i should add some argument or sthg? i cant get the answer that i want,

$(fc -l) gives me hBl as an answer !!
and 'fc -l' gives me fc -l as an answer !!

actually $fc $-l gives me hBl as an answer
$(fc -l) gives me nth as an answer !!

no it's `fc -l` not 'fc -l' but as above i don't think you should use that mechanism at all, just run it normally outside of echo.

what do you mean by outside of echo ?

i have this program:i changed the fc -l command :

# !/bin/bash
#profile program
function histoire {
HISTSIZE=20
echo “HISTSIZE est égale à” $HISTSIZE
echo “le numéro de la commande est” `fc -l`
}
histoire
exit 0

BUT I GET NOTHG AS AN ANSWER !

# !/bin/bash
#profile program
function histoire {
HISTSIZE=20
echo “HISTSIZE est égale à” $HISTSIZE
echo “le numéro de la commande est”
fc -l
}
histoire
exit 0

this also gives me "nthg" as an answer !

do you atually mean "nothing"...? or literally a text string as you wrote?? if fc -l doesn't give you an output, then you have no recorded history to output...

yes i actually mean nthg, just blank space ,
i have a recorded history to output, and i know that because when i type fc -l in my xterm then i get a long list !!

Both of these questions have simple explanations. First, let’s see what fc does (taken from here):
As you can see, fc only works (or should only work) on an interactive shell (i.e., one in which you can interactively type commands).

For example, consider this simple program (which I will save in a text file named program):
Now, watch what happens when I try to execute it as a script:
And watch what happens if I source it into my interactive shell:
As for “hBl”, this is the result expanding “$-l” in a script. You see, it shall be parsed as “${-}l” where the internal variable $- has the flags currently set (this is a ksh-ism borrowed by bash). In this case, the flags set are for brace expansion and command hashing.