11-13-2006
how to execute multi command???
Hi every one
I'm writing C program that do the following:
will creat new sample command in unix using C
let be the name is do.c, the do must execute more the one command
for example do ls ps
it will execute ls the ps
also I should create a log file the track the command and exit status of each one
how I can do that beacuse I don't know who to start(new in UNIX and C programming)...
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi Group ,
I m trying to execute commands on some other system using write command but inspite of executing the commands they r passed as simple messages.
- i m writing
>write user-id
! ls
o
ctrl-d
inspite of executing the command ls,other terminal shows ! ls.
Thnx in advance. (2 Replies)
Discussion started by: Aashish
2 Replies
2. Shell Programming and Scripting
I'm trying to populate a command line into a variable. It appears to be executing, instead. Here's an example:
mycmd=''
if ...; then
$mycmd='sudo '
fi
$mycmd=$mycmd 'sed -i prev s/aaa/bbb/' $myfile
res=`$mycmd`
(I'm also not sure of the best way to execute the command from the... (1 Reply)
Discussion started by: littlejon
1 Replies
3. Shell Programming and Scripting
Hi,
I'm trying to run the following command using sh -c
ie
sh -c "while read EachLine
do
rm -f $EachLine ;
done < file_list.lst;"
It doesn't seem to do anything.
When I run this at the command line, it does remove the files contained in the list so i know the command works
ie... (4 Replies)
Discussion started by: chrispward
4 Replies
4. Shell Programming and Scripting
Hi,
I have a script below for extracting xml from a file.
for i in *.txt
do
echo $i
awk '/<.*/ , /.*<\/.*>/' "$i" | tr -d '\n'
echo -ne '\n'
done
.
I read about using multi threading to speed up the script.
I do not know much about it but read it on this forum.
Is it a... (21 Replies)
Discussion started by: chetan.c
21 Replies
5. Shell Programming and Scripting
I am running the export command within a view to use that value inside my build script. But while executing it it is saying "export command not found"
My code is as follows:
--------------------------
#!/bin/sh
user="test"
DIR="/bldtmp/"$user
VIEW="test.view1"
echo "TMPDIR before export... (4 Replies)
Discussion started by: dchoudhury
4 Replies
6. Shell Programming and Scripting
Hi,
I have a problem where I need to make this input:
nameRow1a,text1a,text2a,floatValue1a,FloatValue2a,...,floatValue140a
nameRow1b,text1b,text2b,floatValue1b,FloatValue2b,...,floatValue140b
look like this output:
nameRow1a,text1b,text2a,(floatValue1a - floatValue1b),(floatValue2a -... (4 Replies)
Discussion started by: nricardo
4 Replies
7. AIX
how to run a command, such as "ls -l core" from one lpar to check multi lpars if core file exist?
or what way can do a command on all lpars from one lpar?
Thanks (1 Reply)
Discussion started by: rainbow_bean
1 Replies
8. Shell Programming and Scripting
Hello :)
new to bash not to programming.
I have an on-going need to change the owning group on sets of files and directories from the one they were created with or changed to on update to the one they need to have going forward.
find {target_root} -group wrong_group
gets me a newline... (4 Replies)
Discussion started by: naftali
4 Replies
9. Shell Programming and Scripting
Hello i am having an issue with bash script and this is the code
now=$(cat hosts1.txt | awk '{print $2;}')
while read n ;do
ssh root@$now 'useradd test1; echo -e "test1\ntest1" | passwd test1 && echo "test1 ALL=(ALL:ALL) ALL" >> /etc/sudoers'
When i execute only part with cat, it... (8 Replies)
Discussion started by: tomislav91
8 Replies
10. UNIX for Beginners Questions & Answers
The following is a multi-line shell command example:
$cargo build
Compiling prawn v0.1.0 (/Users/ag/rust/prawn)
error: failed to resolve: could not find `setup_panix` in `human_panic`
--> src/main.rs:14:22
|
14 | human_panic::setup_panix!();
| ... (2 Replies)
Discussion started by: yogi
2 Replies
LEARN ABOUT REDHAT
pclose
POPEN(3) Linux Programmer's Manual POPEN(3)
NAME
popen, pclose - process I/O
SYNOPSIS
#include <stdio.h>
FILE *popen(const char *command, const char *type);
int pclose(FILE *stream);
DESCRIPTION
The popen() function opens a process by creating a pipe, forking, and invoking the shell. Since a pipe is by definition unidirectional,
the type argument may specify only reading or writing, not both; the resulting stream is correspondingly read-only or write-only.
The command argument is a pointer to a null-terminated string containing a shell command line. This command is passed to /bin/sh using the
-c flag; interpretation, if any, is performed by the shell. The mode argument is a pointer to a null-terminated string which must be
either `r' for reading or `w' for writing.
The return value from popen() is a normal standard I/O stream in all respects save that it must be closed with pclose() rather than
fclose(). Writing to such a stream writes to the standard input of the command; the command's standard output is the same as that of the
process that called popen(), unless this is altered by the command itself. Conversely, reading from a ``popened'' stream reads the com-
mand's standard output, and the command's standard input is the same as that of the process that called popen.
Note that output popen streams are fully buffered by default.
The pclose function waits for the associated process to terminate and returns the exit status of the command as returned by wait4.
RETURN VALUE
The popen function returns NULL if the fork(2) or pipe(2) calls fail, or if it cannot allocate memory.
The pclose function returns -1 if wait4 returns an error, or some other error is detected.
ERRORS
The popen function does not set errno if memory allocation fails. If the underlying fork() or pipe() fails, errno is set appropriately.
If the mode argument is invalid, and this condition is detected, errno is set to EINVAL.
If pclose() cannot obtain the child status, errno is set to ECHILD.
CONFORMING TO
POSIX.2
BUGS
Since the standard input of a command opened for reading shares its seek offset with the process that called popen(), if the original
process has done a buffered read, the command's input position may not be as expected. Similarly, the output from a command opened for
writing may become intermingled with that of the original process. The latter can be avoided by calling fflush(3) before popen.
Failure to execute the shell is indistinguishable from the shell's failure to execute command, or an immediate exit of the command. The
only hint is an exit status of 127.
HISTORY
A popen() and a pclose() function appeared in Version 7 AT&T UNIX.
SEE ALSO
fork(2), sh(1), pipe(2), wait4(2), fflush(3), fclose(3), fopen(3), stdio(3), system(3)
BSD MANPAGE
1998-05-07 POPEN(3)