[LUNA] simple(ton?) bash question ....

[William A. Mahaffey III]

On 11/21/14 14:31, Paul F. Pearson wrote:
>
> "William A. Mahaffey III" <wam at hiwaay.net> wrote:
>> Hmmmm .... I get:
>>
>> [root at Q6600:/etc, Tue Nov 18, 11:04 AM] 1085 # function lltr10 ()
>> {lltr
>> "$*" | tail -10}; export lltr10
>> -bash: syntax error near unexpected token `{lltr'
>> You have new mail in /var/spool/mail/root
>> [root at Q6600:/etc, Fri Nov 21, 11:11 AM] 1086 # which lltr
>> alias lltr='llt -r'
>> [root at Q6600:/etc, Fri Nov 21, 11:11 AM] 1087 # function lltr10 () {
>> lltr
>> "$*" | tail -10 }; export lltr10
>>   > ^C
>> [root at Q6600:/etc, Fri Nov 21, 11:12 AM] 1088 # lltr10 () { lltr "$*" |
>>
>> tail -10 }; export lltr10
>> -bash: syntax error near unexpected token `('
>> [root at Q6600:/etc, Fri Nov 21, 11:13 AM] 1089 #
>>
>>
>> So the spaces around '{' & '}' are necessary (news to me), as
>> (apparently) is the function keyword .... Why does it go into a prompt
>>
>> when I define & export the function ? My ultimate goal is to put this
>>
>> stuff into a bashrc script, either per user or global, which is why I
>>
>> ask .... Thanks & TIA ....
>
> OK, here it is after I actually tried it (I don't have lltr as an alias, so I just used ls -ltr). This works with no reported errors.
>
> $ lltr10() { ls -ltr "$*" | head -10; }
> $ export lltr10
>
> The semicolon is special, as you're specifying a list of commands (technically, Compound Commands). See [1], [2], and [3].
>
> I *think* you're getting the '>' prompt and other errors because of the missing semicolon. I can't say for sure, because I don't know if you put it all on one line, or if email is word-wrapping for us. My examples are all on one line.
>
> [1] http://www.gnu.org/software/bash/manual/bashref.html#Lists
> [2] http://www.gnu.org/software/bash/manual/bashref.html#Shell-Functions
> [3] http://www.gnu.org/software/bash/manual/bashref.html#Compound-Commands
>
>
>
> ------
> Paul F. Pearson
> We all laugh in the same language
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>

*Booooyah* !!!! I now have:

[root at Q6600:/etc, Fri Nov 21, 02:25 PM] 1099 # function lltr10 () { lltr 
"$*" | tail -10; }; export lltr10
[root at Q6600:/etc, Fri Nov 21, 02:46 PM] 1100 # lltr10
ls: cannot access : No such file or directory
[root at Q6600:/etc, Fri Nov 21, 02:46 PM] 1101 # which lltr10
/usr/bin/which: no lltr10 in 
(/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin)
[root at Q6600:/etc, Fri Nov 21, 02:46 PM] 1102 # lltr10  /etc/
30541490    4 -rw-r--r--.  1 root root     1138 May  3  2014 
LIST.BurnDebian.AMD64-7.5.txt
30541495    4 -rw-r--r--.  1 root root     1146 May  3  2014 
LIST.BurnDebian.kfreeBSD-7.5.txt
30541494    4 -rw-r--r--.  1 root root     1106 Jul 12 10:46 
LIST.BurnUBCD-5.30.txt
30541497    4 -rw-r--r--.  1 root root     1148 Jul 12 10:53 
LIST.BurnFreeBSD.10.0.txt
30541496    4 -rw-r--r--.  1 root root     1151 Jul 30 07:37 
LIST.BurnFreeBSD.9.3.txt
30541499    4 -rw-r--r--.  1 root root      526 Sep  9 15:31 hosts
30541491    4 -rw-r--r--.  1 root root     1159 Sep 18 10:47 
LIST.BurnCentOS.5.9.DVD.txt
30539814    4 drwxr-xr-x.  3 root root     4096 Nov 18 10:53 profile.d/
30541498    4 -rw-r--r--.  1 root root      369 Nov 21 11:16 mtab
30539777   12 drwxr-xr-x. 94 root root    12288 Nov 21 11:16 ./
[root at Q6600:/etc, Fri Nov 21, 02:46 PM] 1103 # which lltr
alias lltr='llt -r'
[root at Q6600:/etc, Fri Nov 21, 02:46 PM] 1104 #

& if you make the "$*" into "$@" it works w/ a NULL arg list (as per man 
page, just checked) .... *hoooray* !!!! Thanks.

-- 

	William A. Mahaffey III

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