are there any basic commands that can display lines 99 - 101 of the /etc/passwd file?
I'm thinking use of head and tail, but I forget what numbers to use and where to put /etc/passwd in the command. (2 Replies)
Hi,
When we have a failure, sometimes we just step restart the job from the next step. Later when we open the log for analysis of the failure, it is becoming difficult to go to the failure part.
For eg., if it is a 1000 line log, the failure may be at 500th line. so wat i want to do is, grep... (6 Replies)
I'm Unix. I'm looking at "df" on Unix now and below is an example. It's lists the filesystems out in 512-blocks, I need this in 4k blocks. Is there a way to do this in Unix or do I manually convert and how?
So for container 1 there is 7,340,032 in size in 512-blocks. What would the 4k block be... (2 Replies)
Hello,
I have a file like this:
FILE.TXT:
(define argc :: int)
(assert ( > argc 1))
(assert ( = argc 1))
<check>
#
(define c :: float)
(assert ( > c 0))
(assert ( = c 0))
<check>
#
now, i want to separate each block('#' is the delimeter), make them separate files, and then send them as... (5 Replies)
I'm still beginner and maybe someone can help me.
I have this input:
the great warrior a, b, c
and what i want to know is, with awk, how can i detect the string with 'warrior' string on it and print the a, b, and c seperately, become like this :
Warrior Type
a
b
c
Im still very... (3 Replies)
Hi,
I have a log file which has sessionids in it, each block in the log starts with a date entry, a block may be a single line or multiple lines. I need to sed (or awk) out the lines/blocks with that start with a date and include the session id.
The files are large at several Gb.
My... (3 Replies)
This could be a really dummy question.
I have a log text file.
What unix command to extract line from specific string to another specific string.
Is it something similar to?:
more +/"string" file_name
Thanks (4 Replies)
Hi all,
I hope all you guys have a great new year!
I am trying to swap 2 columns in a specific block of a file. The file format is:
Startpoint: in11 (input port)
Endpoint: out421 (output port)
Path Group: (none)
Path Type: max
Point ... (5 Replies)
Hello.
Here is a file contents :
declare -Ax NEW_FORCE_IGNORE_ARRAY=(="§" ="§" ="§" ="§" ="§" .................. ="§"Here is a pattern
=I want to extract 'NEW_FORCE_IGNORE_ARRAY' which is the whole word before the first occurrence of pattern '='
Is there a better solution than mine :... (3 Replies)
Discussion started by: jcdole
3 Replies
LEARN ABOUT CENTOS
begin
BEGIN(7) PostgreSQL 9.2.7 Documentation BEGIN(7)NAME
BEGIN - start a transaction block
SYNOPSIS
BEGIN [ WORK | TRANSACTION ] [ transaction_mode [, ...] ]
where transaction_mode is one of:
ISOLATION LEVEL { SERIALIZABLE | REPEATABLE READ | READ COMMITTED | READ UNCOMMITTED }
READ WRITE | READ ONLY
[ NOT ] DEFERRABLE
DESCRIPTION
BEGIN initiates a transaction block, that is, all statements after a BEGIN command will be executed in a single transaction until an
explicit COMMIT(7) or ROLLBACK(7) is given. By default (without BEGIN), PostgreSQL executes transactions in "autocommit" mode, that is,
each statement is executed in its own transaction and a commit is implicitly performed at the end of the statement (if execution was
successful, otherwise a rollback is done).
Statements are executed more quickly in a transaction block, because transaction start/commit requires significant CPU and disk activity.
Execution of multiple statements inside a transaction is also useful to ensure consistency when making several related changes: other
sessions will be unable to see the intermediate states wherein not all the related updates have been done.
If the isolation level, read/write mode, or deferrable mode is specified, the new transaction has those characteristics, as if SET
TRANSACTION (SET_TRANSACTION(7)) was executed.
PARAMETERS
WORK, TRANSACTION
Optional key words. They have no effect.
Refer to SET TRANSACTION (SET_TRANSACTION(7)) for information on the meaning of the other parameters to this statement.
NOTES
START TRANSACTION (START_TRANSACTION(7)) has the same functionality as BEGIN.
Use COMMIT(7) or ROLLBACK(7) to terminate a transaction block.
Issuing BEGIN when already inside a transaction block will provoke a warning message. The state of the transaction is not affected. To nest
transactions within a transaction block, use savepoints (see SAVEPOINT(7)).
For reasons of backwards compatibility, the commas between successive transaction_modes can be omitted.
EXAMPLES
To begin a transaction block:
BEGIN;
COMPATIBILITY
BEGIN is a PostgreSQL language extension. It is equivalent to the SQL-standard command START TRANSACTION (START_TRANSACTION(7)), whose
reference page contains additional compatibility information.
The DEFERRABLE transaction_mode is a PostgreSQL language extension.
Incidentally, the BEGIN key word is used for a different purpose in embedded SQL. You are advised to be careful about the transaction
semantics when porting database applications.
SEE ALSO COMMIT(7), ROLLBACK(7), START TRANSACTION (START_TRANSACTION(7)), SAVEPOINT(7)PostgreSQL 9.2.7 2014-02-17 BEGIN(7)