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about READ...please help!
Post 302101177 by fiol73 on Thursday 28th of December 2006 07:32:11 PM
12-28-2006
about READ...please help!
hi guys i have a question:
i am creating an interactive programme and i need some help on the READ command. let's say that i use the echo command and ask something to my user in the form:
echo 'Please, insert filenames: \c'
then i read his/her answer with:
read answer
i need to test the answer given to see, for example, if the user has really chosen files and not directories for example so i use:
if [[ -d $answer ]]; then
echo 'Attention: you have selected a directory!'
fi
now my problem is this: if the user, instead of just one file, writes 2 or more files?
i know i can write:
read answer1 answer2 etc.
but then it becomes too difficult to check all variables in the IF STATEMENT...and also...what if the user uses more variables than those i have specified? too complicated...
any suggestion on how to include all the possible filenames the user could specify in just one variable to check? (a bit like $@ instead of "$1" "$2" etc.)
hope my question is clear...
thanks.
i am creating an interactive programme and i need some help on the READ command. let's say that i use the echo command and ask something to my user in the form:
echo 'Please, insert filenames: \c'
then i read his/her answer with:
read answer
i need to test the answer given to see, for example, if the user has really chosen files and not directories for example so i use:
if [[ -d $answer ]]; then
echo 'Attention: you have selected a directory!'
fi
now my problem is this: if the user, instead of just one file, writes 2 or more files?
i know i can write:
read answer1 answer2 etc.
but then it becomes too difficult to check all variables in the IF STATEMENT...and also...what if the user uses more variables than those i have specified? too complicated...
any suggestion on how to include all the possible filenames the user could specify in just one variable to check? (a bit like $@ instead of "$1" "$2" etc.)
hope my question is clear...
thanks.
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LEARN ABOUT REDHAT
start_transaction
START
TRANSACTION(7) SQL Commands START TRANSACTION(7) NAME
START TRANSACTION - start a transaction block SYNOPSIS
START TRANSACTION [ ISOLATION LEVEL { READ COMMITTED | SERIALIZABLE } ] INPUTS None. OUTPUTS START TRANSACTION Message returned if successful. WARNING: BEGIN: already a transaction in progress If there is already a transaction in progress when the command is issued. DESCRIPTION
This command begins a new transaction. If the isolation level is specified, the new transaction has that isolation level. In all other respects, the behavior of this command is identical to the BEGIN [begin(7)] command. NOTES
The isolation level of a transaction can also be set with the SET TRANSACTION [set_transaction(7)] command. If no isolation level is speci- fied, the default isolation level is used. COMPATIBILITY
SQL99 SERIALIZABLE is the default isolation level in SQL99, but it is not the usual default in PostgreSQL: the factory default setting is READ COMMITTED. PostgreSQL does not provide the isolation levels READ UNCOMMITTED and REPEATABLE READ. Because of lack of predicate locking, the SERIALIZABLE level is not truly serializable. See the User's Guide for details. In SQL99 this statement can specify two other properties of the new transaction: whether the transaction is read-only and the size of the diagnostics area. Neither of these concepts are currently supported in PostgreSQL. SQL - Language Statements 2002-07-26 START TRANSACTION(7)