Hi!
All!
I am wirting a shell script in which i want to read one line
at a time from the file and write it simultaneouly to other file one line at a time.
Please let me know about some shell utility which can help me out.
Thanx.
If further clarifications are needed then please let me know... (2 Replies)
Hi,
There are two scripts. The second script is called from the first one. These will create two processes on unix. In the second script, there is a read statement in the while loop.
Under unexpected conditions, at the time of reading response from the user, if the terminal hungup happens,... (1 Reply)
just have a muddled head at the moment... bare with me.
say i have a variable $count... and a list in a file
i want to use the $count line from that textfile but don't seem to recall how to access it?
eg
user=`cat file1.txt` # user to be $count line in that list?
eg
david... (7 Replies)
Hi All,
Please advise . Welcome more suggestions.
For examples, I have 1000 file with prefix x??? In fact, I want to convert them to x???.txt with max 10 files at a time. As such, I will need to call another script to read from those 10 *txt files and sleep 5000 to convert the next 10 again.... (10 Replies)
Hi the following c-code utilizing the 'read()' man 2 read method cant read in files larger that 2gig.
Hi I've found a strange problem on ubuntu64bit, that limits the data you are allowed to allocate on a 64bit platform using the c function 'read()'
The following program wont allow to allocate... (14 Replies)
Hi
I am new to writing script and want to use a Bash Piped while-read and read from user input.
if something happens on server.log then do while loop or if something happend on user input then do while loop.
Pseudocode something like:
tail -n 3 -f server.log | while read serverline || read... (8 Replies)
Hello community,
what I need to do is read 2 rows at time from a file. I have this simple solution:
File to read:
LINE1
LINE2
LINE3
LINE4
LINE5
LINE6
LINE7
LINE8Read routine:#!/bin/ksh
sed '1,3d' /out.txt | while read line; do
read line2
echo $line $line2
doneResult:LINE1... (5 Replies)
Hi,
When can the read() system call gives timeout error when the same connection worked for writing data to the other end of the socket, while the next call with read() gives timeout error?
Can anyone please explain when this kind of situation appears?
Thanks,
Sanzee (2 Replies)
How to read multiple files at simultaneously? (1 Reply)
Discussion started by: Priyanka_M
1 Replies
LEARN ABOUT X11R4
exec
exec(1) User Commands exec(1)NAME
exec, eval, source - shell built-in functions to execute other commands
SYNOPSIS
sh
exec [argument...]
eval [argument...]
csh
exec command
eval argument...
source [-h] name
ksh
*exec [arg...]
*eval [arg...]
DESCRIPTION
sh
The exec command specified by the arguments is executed in place of this shell without creating a new process. Input/output arguments may
appear and, if no other arguments are given, cause the shell input/output to be modified.
The arguments to the eval built-in are read as input to the shell and the resulting command(s) executed.
csh
exec executes command in place of the current shell, which terminates.
eval reads its arguments as input to the shell and executes the resulting command(s). This is usually used to execute commands generated as
the result of command or variable substitution.
source reads commands from name. source commands may be nested, but if they are nested too deeply the shell may run out of file descrip-
tors. An error in a sourced file at any level terminates all nested source commands.
-h Place commands from the file name on the history list without executing them.
ksh
With the exec built-in, if arg is given, the command specified by the arguments is executed in place of this shell without creating a new
process. Input/output arguments may appear and affect the current process. If no arguments are given the effect of this command is to mod-
ify file descriptors as prescribed by the input/output redirection list. In this case, any file descriptor numbers greater than 2 that are
opened with this mechanism are closed when invoking another program.
The arguments to eval are read as input to the shell and the resulting command(s) executed.
On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not
performed.
EXIT STATUS
For ksh:
If command is not found, the exit status is 127. If command is found, but is not an executable utility, the exit status is 126. If a redi-
rection error occurs, the shell exits with a value in the range 1-125. Otherwise, exec returns a zero exit status.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO csh(1), ksh(1), sh(1), attributes(5)SunOS 5.10 17 Jul 2002 exec(1)