12-27-2006
See the man pages for lsof and fuser.
10 More Discussions You Might Find Interesting
1. Programming
Hi all,
I have a problem in handling files through C.
here is the problem im having:
i will query the database (for instance consider employees table )
for empno,ename,job,salary fields.The query returns me some 100 of rows. now i need to place them in a file in row wise pattern as they... (3 Replies)
Discussion started by: trinath
3 Replies
2. UNIX for Advanced & Expert Users
Hi,
I have a log file which runs into 3 to 5 GB.
We store this typically for 6 months. When a new month starts we move the previous month into a 9 month back up log (file.9m) and delete the last month of the 9 month back up.
Iam using awk to find the data and cat to join the files like... (3 Replies)
Discussion started by: baanprog
3 Replies
3. UNIX for Advanced & Expert Users
sir i have to get first line from a file
for example
>cat file1
abc
zxc
asd
adsf
from that file1 i need only first line
expected result
>abc
please help me ! (1 Reply)
Discussion started by: ponmuthu
1 Replies
4. UNIX for Advanced & Expert Users
my input for a script is another csv file
but in that file say 7 lines are there ...
how can i get line by line to that input
for example :
>cat link.csv
www.yahoo.com,yahoo
www.google.com,google
www.unix.com,unix
another file
in that file i need to ping the above links
... (2 Replies)
Discussion started by: ponmuthu
2 Replies
5. Shell Programming and Scripting
I have been doing automation of daily check activity for a server, i have been using sqls to retrive the data and while loop for reading the data from the file for several activities. BUT i got a show stopper the below one.. where the data is getting store in $temp_file, but not being read by while... (1 Reply)
Discussion started by: KuldeepSinghTCS
1 Replies
6. Programming
$# some text
$$ some text
$@ some text
$$. some text
Mg1 some text
Mg2 some text
.
.
.
Mg10 some text
The above 10 lines are to be extracted except the lines starting from $#,$$.,... (4 Replies)
Discussion started by: baig.abdul
4 Replies
7. Shell Programming and Scripting
Specifically on RHEL 5.7.
When does the underlying ksh process open and close files? Every time they're accessed, or as little as possible?
Say you have some script like:
CreateFiles()
{
grep "<VALUE1>" ${infile} >> ${outfile}
grep "<VALUE2>" ${infile} >> ${outfile}
...... (4 Replies)
Discussion started by: CarloM
4 Replies
8. UNIX for Dummies Questions & Answers
Hi Team,
I am trying to cut a large file into multiple files. It has
Header
50,050 records
Trailer
-------------------------------------------
I need to cut the files into multiple files of 1000 records and should have the same header and trailer as the original files.
... (4 Replies)
Discussion started by: Gurkamal83
4 Replies
9. UNIX for Dummies Questions & Answers
I have a file
1
298167
298168
1093209
1093210
1422663
I want to write a code where in I want to read contents of above file
like first read is 1
second read is 298167
Substract second read from first and if this is greater than or less than 99,999.
Similarly I want to traverse thru... (3 Replies)
Discussion started by: Guru148
3 Replies
10. Shell Programming and Scripting
Hi All,
I need to extract the data from the text file. The data of the text file is shown below
#L 0.000017 4.329939 0.000017 4.716267 r7.9 P 1 1;Net=IN32
The extracted data should be IN32. Could anyone help to script in c shell.? (4 Replies)
Discussion started by: gopishrine
4 Replies
system(3S) system(3S)
NAME
system() - issue a shell command
SYNOPSIS
DESCRIPTION
executes the command specified by the string pointed to by command. The environment of the executed command is as if a child process were
created using (see fork(2)), and the child process invoked the sh-posix(1) utility via a call to (see exec(2)) as follows:
ignores the and signals, and blocks the signal, while waiting for the command to terminate. If this might cause the application to miss a
signal that would have killed it, the application should examine the return value from and take whatever action is appropriate to the
application if the command terminated due to receipt of a signal.
does not affect the termination status of any child of the calling processes other than the process or processes it itself creates.
does not return until the child process has terminated.
APPLICATION USAGE
If the return value of is not -1, its value can be decoded through the use of the macros described in For convenience, these macros are
also provided in
Note that, while must ignore and and block while waiting for the child to terminate, the handling of signals in the executed command is as
specified by fork(2) and exec(2). For example, if is being caught or is set to when is called, the child is started with handling set to
Ignoring and in the parent process prevents coordination problems (such as two processes reading from the same terminal) when the executed
command ignores or catches one of the signals.
RETURN VALUE
If command is null, returns non-zero.
If command is not null, returns the termination status of the command language interpreter in the format specified by wait(2). The termi-
nation status of the command language interpreter is as specified for sh-posix(1), except that if some error prevents the command language
interpreter from executing after the child process is created, the return value from is as if the command language interpreter had termi-
nated using If a child process cannot be created, or if the termination status for the command language interpreter cannot be obtained,
returns -1 and sets to indicate the error.
DIAGNOSTICS
forks to create a child process which, in turn, in order to execute string. If the fork fails, returns -1 and sets If the exec fails,
returns the status value returned by (see wait(2)) for a process that terminates with a call of
ERRORS
If errors are encountered, sets values as described by fork(2).
FILES
SEE ALSO
sh(1), fork(2), exec(2), wait(2), thread_safety(5).
STANDARDS CONFORMANCE
system(3S)