I have an application which has a lot of cout & cerr statements.
This application also opens a log file (for eg a.log).
When this application is run from the inittab file as follows
/bin/sh -c " . /etc/timezone; exec /test"
all the cout & cerr statements are printed in the log file... (1 Reply)
Hello Everyone,
I have an option for users in my shell script to create log file. So if user saying “yes” on it, I'm redirecting all output to log file by doing this: > /output.log. However I would like the output being displayed on the screen at the same time. Is it possible? If yes, does anybody... (2 Replies)
I have to confirm that an engine was not able to run. In the output below you see that it indeed got errors, but it didn't send those messages to the output file. When I run the same thing with a different executable it works. So does this mean something in the executable could cause it not to... (7 Replies)
Hi all,
I would like to store the output of a command in a variable and output it to the console at the same time. This is working fine using the following construct
var=`command | tee /dev/tty`
I use this in some scripts to display the output of the command on the console and, at the same... (2 Replies)
Hello,
There is pipe chain and I want concacenate piped data with some variable:
balh blah| ... $var1
What command I should use instead ... to concatenate piped output with $var1. I think I coud solve this using temp var - but could it be done in one line like sample above ?
thanks... (4 Replies)
Currently, i am trying to create a simple robust script that is intended to move the contents of a given source directory to a target directory. Optionally, the script should allow to either move the whole source dir content, or dotfiles only, or visible files only. I am aware the target directory... (0 Replies)
hi
i have a script named mount.sh under the location /data/scripts/ in my aix box
i want this script this to be run everyday morning at 04:45 AM and the output of the script should be piped to a file
how to do this ? (3 Replies)
Hi,
Pls check that '|' and '+' present in Step-1 are not copied to log file in Step-3.
Pls suggest how to get the exact output from Step-1 (i.e. with out losing '|' and '+') in to a log file
~Thanks
Step-1: Execute command
> mysql -utest -ptest -htesthost testdb -e "select * from... (3 Replies)
Hi All,
Please could anyone advise what the purpose of the dot syntax in the following command means:
tar -cvf ${WORKING_BACKUP_ROOT}/${TAR_ARCHIVE_FILE} . >/${BACKUP_ROOT}/${ARCHIVE_LOG}
Many thanks (2 Replies)
Discussion started by: daveu7
2 Replies
LEARN ABOUT MINIX
popen
POPEN(3) Library Functions Manual POPEN(3)NAME
popen, pclose - initiate I/O to/from a process
SYNOPSIS
#include <stdio.h>
FILE *popen(const char *command, const char *type)
int pclose(FILE *stream)
DESCRIPTION
The arguments to popen are pointers to null-terminated strings containing respectively a shell command line and an I/O mode, either "r" for
reading or "w" for writing. It creates a pipe between the calling process and the command to be executed. The value returned is a stream
pointer that can be used (as appropriate) to write to the standard input of the command or read from its standard output.
A stream opened by popen should be closed by pclose, which waits for the associated process to terminate and returns the exit status of the
command.
Because open files are shared, a type "r" command may be used as an input filter, and a type "w" as an output filter.
SEE ALSO pipe(2), fopen(3), fclose(3), system(3), wait(2), sh(1).
DIAGNOSTICS
Popen returns a null pointer if files or processes cannot be created, or the shell cannot be accessed.
BUGS
Buffered reading before opening an input filter may leave the standard input of that filter mispositioned. Similar problems with an output
filter may be forestalled by careful buffer flushing, for instance, with fflush, see fclose(3).
7th Edition May 15, 1985 POPEN(3)