simple bash
. All these files need to be closed, but don't know where to put close
Unlike the open() system call (which opens the lowest available file descriptor), the shell file redirection operation >> "$x" closes standard output (file descriptor 1) if it is currently open and opens the file named by the expansion of $x as as file descriptor 1 with the append flag set.
If for some reason you are opening files with different file descriptors (instead of reusing a single file descriptor), you can close standard input with <&-, close standard output with >&-, close an input file using file descriptor n with n<&-, and close an output file using file descriptor n with n>&-.
This User Gave Thanks to Don Cragun For This Post:
Dear All,
I would like to split a file of the following format into multiple files based on the number in the 6th column (numbers 1, 2, 3...):
ATOM 1 N GLY A 1 -3.198 27.537 -5.958 1.00 0.00 N
ATOM 2 CA GLY A 1 -2.199 28.399 -6.617 1.00 0.00 ... (3 Replies)
Hey everyone.
I am trying to figure out a way to create a file that will be renamed based off of one of multiple files. For example, if I have 3 files (cat.ctl, dog.ctl, and bird.ctl) that gets placed on to an ftp site I want to create a single file called new.cat.ctl, new.dog.ctl, etc for each... (3 Replies)
I am a newbie to shell scripting ..
I have a .csv file. It has 1000 some rows and about 7 columns...
but before I insert this data to a table I have to parse it and clean it ..basing on the value of the first column..which a string of phone number type...
example below..
column 1 ... (2 Replies)
Hi,
I'm using AIX(ksh shell).
> cat temp.txt
"a","b",0
"c",bc",0
"a1","b1",0
"cc","cb",1
"cc","b2",1
"bb","bc",2
I want the output as:
"a","b","c","bc","a1","b1"
"cc","cb","cc","b2"
"bb","bc"
I want to combine multiple lines into single line where third column is same.
Is... (1 Reply)
Hi Friends,
I have a single column data like below.
1
2
3
4
5
I need the output like below.
0
1
2
3
4
where each row (including first row) subtracting from first row and the result should print below like the way shown in output file.
Thanks
Sid (11 Replies)
Hi,
i need a single command to create multiple empty files(no trailing lines as well) and empty the files if already existing.
please let me know or if this has been ansered, if some ocan share the link please, thanks
> newfile.txt
or
:> newfile.txt
do not work (4 Replies)
Hi,
I want to convert a single row values to multiple rows, but the no. of rows are not fixed.
For example, I have a row as below
abc-def-lmn-mno-xyz
out put should be
get abc
get def
get lmn
get xyz (4 Replies)
Hello:
I am working parsing a large input file which will be broken down into multiples based on the second field in the file, in this case: STORE.
The idea is to create each file with the corresponding store number, for example: Report_$STORENUM_$DATETIMESTAMP , and obtaining the... (7 Replies)
Hi All,
I have the sales_data.csv file in the directory as below.
SDDCCR; SOM ; MD6546474777 ;05-JAN-16
ABC ; KIRAN ; CB789 ;04-JAN-16
ABC ; RAMANA; KS566767477747 ;06-JAN-16
ABC ; KAMESH; A33535335 ;04-JAN-16
SDDCCR; DINESH; GD6674474747 ;08-JAN-16... (4 Replies)
Hi ALL,
We have requirement in a file, i have multiple rows.
Example below:
Input file rows
01,1,102319,0,0,70,26,U,1,331,000000113200000011920000001212
01,1,102319,0,1,80,20,U,1,241,00000059420000006021
I need my output file should be as mentioned below. Last field should split for... (4 Replies)
Discussion started by: kotra
4 Replies
LEARN ABOUT BSD
close
CLOSE(2) System Calls Manual CLOSE(2)NAME
close - delete a descriptor
SYNOPSIS
close(d)
int d;
DESCRIPTION
The close call deletes a descriptor from the per-process object reference table. If this is the last reference to the underlying object,
then it will be deactivated. For example, on the last close of a file the current seek pointer associated with the file is lost; on the
last close of a socket(2) associated naming information and queued data are discarded; on the last close of a file holding an advisory lock
the lock is released (see further flock(2)).
A close of all of a process's descriptors is automatic on exit, but since there is a limit on the number of active descriptors per process,
close is necessary for programs that deal with many descriptors.
When a process forks (see fork(2)), all descriptors for the new child process reference the same objects as they did in the parent before
the fork. If a new process is then to be run using execve(2), the process would normally inherit these descriptors. Most of the descrip-
tors can be rearranged with dup2(2) or deleted with close before the execve is attempted, but if some of these descriptors will still be
needed if the execve fails, it is necessary to arrange for them to be closed if the execve succeeds. For this reason, the call ``fcntl(d,
F_SETFD, 1)'' is provided, which arranges that a descriptor will be closed after a successful execve; the call ``fcntl(d, F_SETFD, 0)''
restores the default, which is to not close the descriptor.
RETURN VALUE
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and the global integer variable errno is set to
indicate the error.
ERRORS
Close will fail if:
[EBADF] D is not an active descriptor.
SEE ALSO accept(2), flock(2), open(2), pipe(2), socket(2), socketpair(2), execve(2), fcntl(2)4th Berkeley Distribution May 22, 1986 CLOSE(2)