Re: FWD: About Bash Script

[Curtis]

I actually re-wrote it and got it working.

Thanks for the suggested reading Mart, i'll definitely look those
over.

Thanks for all the help!

Re: FWD: About Bash Script

[Curtis]

Thanks pk!

That's the same thin Greg told me.

#!/bin/bash


if [! -e b.txt];

then

mv a.txt b.txt

exit

fi



#The previous commands checks to see if b.txt is NOT already there, if
NOT, it renames a.txt to b.txt



#If the script gets here, b.txt EXISTS..

# does_exist is a recursive functionlooking at b.txt(i) ..the
first b.txt(some number) it finds NOT existing...it creates



set i = 1

does_exist[]



if [-e b.txt.$i];
{

then

i = i +1

does_exist

else

mv a.txt b.txt.$i
exit
fi
}


I'm close but getting an eror near the last linenot really sure
why
./test: line 25: syntax error near unexpected token `fi'
./test: line 25: `fi'

Re: FWD: About Bash Script

[Curtis]

Thanks Greg for the resource material! I'm making changes now

Re: FWD: About Bash Script

[Curtis]

Here's what I have but i'm getting some errors

#!/bin/bash


if ! (-e b.txt);



then

mv a.txt b.txt

exit

fi



#The previous commands checks to see if b.txt is NOT already there, if
NOT, it renames a.txt to b.txt



#If the script gets here, b.txt EXISTS..

# does_exist is a recursive functionlooking at b.txt(i) ..the
first b.txt(some number) it finds NOT existing...it creates



set i = 1

does_exist()

{



if (-e b.txt.$1);

then

i = i +1

does_exist

else

mv a.txt b.txt.$i

exit

fi

}

Re: FWD: About Bash Script

[Mart Frauenlob]

On 16.02.2010 19:52, Curtis wrote:
> Thanks pk!
> 
> That's the same thin Greg told me.
> 
> #!/bin/bash
> 
> 
> if [! -e b.txt];

if [[ ! -e b.txt ]; then ...; fi

or

if [[ ! - b.txt ]]
then
...
fi

you only need the semicolon if you omit the newline.

> 
> then
> 
> mv a.txt b.txt
> 
> exit
> 
> fi
> 
> 
> 
> #The previous commands checks to see if b.txt is NOT already there, if
> NOT, it renames a.txt to b.txt
> 
> 
> 
> #If the script gets here, b.txt EXISTS..
> 
> # does_exist is a recursive functionlooking at b.txt(i) ..the
> first b.txt(some number) it finds NOT existing...it creates
> 
> 
> 
> set i = 1

set??? see: help set

i=1
or
declare i=1

see: help declare (in you bash prompt)

> 
> does_exist[]

you want to define a function?

does_exist() {


}

> 
> 
> 
> if [-e b.txt.$i];
> {

this `{' one is bad here.

> 
> then
> 
> i = i +1

i=$((i + 1))
or
i=$((i++))
or
let i++
or
let i+=1

> 
> does_exist
> 
> else
> 
> mv a.txt b.txt.$i
> exit
> fi
> }
> 
> 
> I'm close but getting an eror near the last linenot really sure
> why
> ./test: line 25: syntax error near unexpected token `fi'
> ./test: line 25: `fi'
> 

May i suggest some readings:

http://tldp.org/LDP/abs/html/index.html
http://bash-hackers.org/wiki/doku.php/start
http://mywiki.wooledge.org/BashFAQ
http://tiswww.case.edu/php/chet/bash/FAQ

I sent you this link in my first reply to you:
http://groups.google.com/group/comp.unix.shell/browse_thread/thread/233d175274e246bd/b4deba6bf5fea99a?lnk=raot

This thread talks about race conditions, that is what i based my first
piece of code for you on. That's why i tried not to use
if condition then react - type of stuff.
Might not affect you at all.

However, we see what you are trying to do, but we don't know what for.
I guessed file downloading, greg guessed log rotating.
It might be a good idea to provide some more information, because that
might lead to different solutions.

Again however, as i didn't do that before myself, i tried to write some
what hopefully meets your requirements:

#!/bin/bash

f() {
[[ $2 ]] || return 1
set -f
set -C
local in_file="$1" out_file="$2"
local i=0 ext=
(
until command exec 3> "$out_file$ext"; do
ext=.$((i++))
done
exec cat "$in_file" >&3
) 2>/dev/null || exit 1
}

f /tmp/a /tmp/b || echo "error"

---
the function takes 2 parameters, the name of the input file and the name
of the file which may already exist.
read the above link, it explains like all commands used here.

Best regards

Mart

Re: FWD: About Bash Script

[pk]

Curtis wrote:

> if [! -e b.txt];

Please note that should literally be

if [ ! -e b.txt ];

NOT

if [! -e b.txt];

Try running the latter and you'll get errors.

Re: FWD: About Bash Script

[pk]

Curtis wrote:

> Here's what I have but i'm getting some errors
> 
> #!/bin/bash
> 
> 
> if ! (-e b.txt);

ITYM

if [ ! -e b.txt ]; then
...

Re: bash-4.1: incorrect substitution of extended glob pattern when recalled with !$

[Chet Ramey]

On 2/13/10 6:03 PM, Rajeev V. Pillai wrote:
> Configuration Information [Automatically generated, do not change]:
> Machine: i686
> OS: linux-gnu
> Compiler: gcc
> Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' 
> -DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu' 
> -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/local/share/locale' -DPACKAGE='bash' 
> -DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -O3 
> -fomit-frame-pointer -march=native -mfpmath=sse -m3dnow -mmmx -msse -pipe
> uname output: Linux athlon.localdomain 2.6.32.8 #1 PREEMPT Wed Feb 10 
> 08:06:34 IST 2010 i686 GNU/Linux
> Machine Type: i686-pc-linux-gnu
> 
> Bash Version: 4.1
> Patch Level: 2
> Release Status: release
> 
> Description:
>   When ``shopt -s extglob'' is set, bash-4.1 does not substitute the
>   complete extended glob pattern when !$ is used to recall it.

Thanks for the report.  The history library actually understands very
little shell syntax.  Readline-6.2 will do a slightly better job.

Chet
-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRUc...@case.eduhttp://cnswww.cns.cwru.edu/~chet/