Programming :: Send The Output Of A Command In A File Defined By A Eval $"$var1"?

Jul 7, 2010

Here is the block of code : (The red part is the code that doesn't work) The file is not created and see the output after the code. # i loop create environment structure and k loop create std procedure sub structure.

eval mkdir $"acsayul02501_${i}"
eval chmod 2770 $"acsayul02501_${i}"


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General :: Send The Output Of Send Command To A File?

Jan 20, 2011

in the middle of script, i need to send the output of (send command on line 8) to a file

spawn telnet
expect "ENTER USERNAM <"


i treid the below on line 8 :

1- send "show command;

" > logfile.txt : gives an error extra character after the "

2- logsave logfile.txt 'send "show command;

" ': error invalid command

3- i simply tried to send the output of the whole script to file logsave /home/logfile ./script : seems that logsave work under root only

4- ./script > logfile : the problem with this is that the output of echo or (read "enter your id") command will not be displayed on the screen (actually nothing will be displayed, i have to open the log file to see the output). is there any way to save the log of the "send" ? or to save the log of the complete script without hiding the output on the screen?

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Programming :: Effect Of Using Eval To Execute A Command As Opposed To Writing It On The Command-line?

Jun 18, 2010

Code: cmd='date | wc'

$cmd If this script is executed, an error is generated. The reason written was that "The execution fails because the pipe is not expanded and is passed to date as an argument".What is meant by expansion of pipe. When we execute date | wc on the command line, it goes fine.then | is not treated as an argument. Why?

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Programming :: PyGTK: Send Output From A File Descriptor To A Textview?

Jul 22, 2010

Within PyGTK I'm using gobject.spawn_async to launch a bash script. I would like the output of that bash script to be displayed within my application. I have a textview set up to receive the text ...

Here are the commands that launch the program:

def run_command(command):
global keep_pulsing
(cpid, cstdin, cstdout, cstderr) = gobject.spawn_async(command,flags=gobject.SPAWN_DO_NOT_REAP_CHILD|gobject.SPAWN_STDERR_TO_DEV_NULL,standard_code....

Here are the two callback functions. But like I say ... I have no idea how to get that data from the 'cstdout' file descriptor into a textbuffer.

textview = wTree.get_widget('textview1')
def update_textview_callback(fd, condition):
global keep_pulsing
if keep_pulsing:

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Programming :: Bash Ambiguous Redirect - Redirect One Command Output Which Will Be Treat As A Content Of File For Another Command?

Mar 9, 2011

I am trying to grep multiple numbers from file, grep does have the -f option for that.

Code: grep -f <`seq 500 520` /etc/passwd I know this could be done with

Code: for i in `seq 500 520`; do grep "$i" /etc/passwd; done But my question is fare more behind this example. It is possible to redirect one command output which will be treat as a content of file for another command ?

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Programming :: Run A User-defined Command Without Sudo ?

Jan 24, 2011

I wrote a shell script and was able to compile it using SHC. after that i copied it to the /bin folder and tried running it as a normal user, but i keep getting the error " operation not permitted killed "

I tried changing the permissions. but it doesn't work. it only works with sudo. there must be another way. otherwise it won't be linux right?

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General :: Make A Script To Send Output Of Top Command In Mail?

Mar 4, 2010

How can i make a script to send the output of top command in mail.
i have to mail the output to another person , tell me how can i do this

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General :: Data From Input File To Be Taken And Send To Output File?

Jul 24, 2010

I am new to shell scripting.What i am trying is to write a shell script which take the input file and output should like as mentioned below.Output file should have data till SOK (marked in red)from every second line and then the selected data(marked in green) from 4th line.So selected data from 2nd and 4th line in one line of O/P file and then similarly selected data from 6th and 8th line in second line of O/P file.Input File:

< c1111;;pOK;SOK:abcde;Universe:aa


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Fedora :: Defined Aliases In File Not Working - No Command Found

Apr 15, 2011

Defining tcsh aliases through a .aliases file has worked perfectly for me for years and years using cygwin and older versions of mandriva. I am encountering very annoying and mysterious problems when attempting to do the same thing with a .aliases file in a fedora 64-bit VM. Strangely, if I define aliases in the file, they won't work, but if I do so on the command line, then they will.

Here's a simple example: Suppose I define an alias for "ls" in the file:
alias ls '/bin/ls'
Then source the file. This happens:
me: ls : Command not found.
me: alias ls
me: /bin/ls
file1 file2 file3 etc.
me: unalias ls
me: ls
file1 file2 file3 etc.
me: alias ls '/bin/ls'
me: ls
file1 file2 file3 etc.

A second example: if I place either of these lines in my .aliases file:
alias d '/bin/ls -alF !:1'
alias d '/bin/ls -alF !*'and source the alias file, this happens:/ me: d
Bad ! arg selector. However, if I define the alias on the command line:
/ me: alias d '/bin/ls -alF !*'then the alias behaves correctly:/ me: dtotal 376
drwxr-xr-x. 10 r r 4096 Apr 14 16:05 ./
drwxrwxr-x. 6 r r 4096 Feb 21 16:15 ../
drwxr-xr-x. 3 r r 4096 Apr 14 16:05 bin.v2/
-rwxr-xr-x. 1 r r 193872 Apr 14 15:35 bjam*
-rw-r--r--. 1 r r 52804 Apr 14 17:20
drwxr-xr-x. 77 r r 4096 Nov 17 09:49 boost/
-rw-r--r--. 1 r r 989 Nov 17 04:51 boost.css

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Programming :: Send A Mysql Query Output Into An Array?

Jul 27, 2010

i will be quick, im trying to send a mysql query output into an array ie:

declare -a HD
HD=`echo "USE db; SELECT uid FROM user" | mysql -u $login -p$pwd -h $dbhost -B`
echo ${#HD}
those vars in mysql connection are previously and correctly assigned.
but got an error 2: declare: not found

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Programming :: Created A File With A Pre-defined Size ?

Feb 19, 2010

I have created a file with a pre-defined size as follows:

#define FILEPATH "testfile"
#define FILESIZE 16


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General :: Send Output To Both The Screen And A Txt File?

Jan 29, 2010

I am currently using this command


apt-get install samba --force-yes -y > /sambainstall.txt This suppresses the screen output and sends it all to a text file, how do I have both?

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Programming :: Find Command With Standard Error Output And Mail Error File

Nov 11, 2010

We make everyday a DB Mysql backup on Linux redhat Enterprise. We are using a bash shell script (and putting it in the crontab) to execute it automatically everyday. We added a line to this script telling, once the backup has completed, to find old backup files (stored on hard disk after each backup) older than x days to remove them. We use the find command (search for file type) with the mtime option and in combination with rm command. Everything runs ok but we also want to add some new code to the same line: If find command cannot find anything or fails, for example if it cannot delete file or fails, send the error message (standard error output) to an error file (like error000001 and increasing) and mail the errorxxxx file to an email address for example to What would be the code for this issue to add it to our find command in the same bash shell script??

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Programming :: Including User Defined Header File?

Apr 29, 2011

i got a sample.c which generate a linked list for sorting according to the number generated. then i want to split the sorting function into a header file. and it looks like the sort function in the header file could not access the linked list in the main. the error is dereferencing pointer to incomplete type



#include <stdio.h>
#include <stdlib.h>
#include <time.h>


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Red Hat / Fedora :: Eval Command Not Installed?

Mar 8, 2010

I have Redhat ES4 installed and am trying to run the following commands

set CMD="ksh - eval $Pfile -csh"
$Pfile is a script
and it get the error
ksh: eval: No such file or directory

also, there are no man pages for eval

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Ubuntu Servers :: Use The Mail Command Line Program To Occasionally Send Log Output To Email Aliases?

Jan 27, 2011

Can anyone tell me what the pros and cons are between heirloom-mailx vs mailutils? This is for ubuntu 10.04 LTS. AT this point my only purpose is to use the mail command line program to occasionally send log output to email aliases.

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Programming :: Show The Output Of Shell Command Into A Textbox, Ex Ps -efc Command?

Oct 20, 2010

I am using gtk to program GUI. How can I show the output of shell command into a textbox, ex ps -efc command ?

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Programming :: Using Eval In Bash?

Nov 23, 2010

Having a problem with an unwanted redirection in in a function call. Although this isn't the function it does illustrate the problem:

doat () {
ALL="sys1 sys2"
for Sys in $ALL;do
echo "---> $Sys <---";
echo $(eval echo $1);


figure out how to get the variable into the command without outputting to the file in the eval statement? So that ssh line that gets executed would look like the following to each iteration of the for loop:

ssh root@$Sys rpm -qa|sort > /trans/${Sys}-rpm-list.txt;
doat works when the incoming argument doesn't have any redirection in the command.

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Programming :: Using Eval To Remove Backslashes?

Jun 21, 2010

I am using bash. My question is :

eval echo \h
eval echo \h
both give output as h, but
eval echo \\h
gives output as h Why ?

Does eval here just remove backslashes (I know the use of eval in the case where substitutions occur)

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General :: Append Command Output To File By Giving Command In Terminal?

Jul 3, 2009

I am using openSUSE 10.3.When I install software from tarball then to record time required I send output of date to beg.txt(when installation begins) and end.txt (when installation finishes).How can I append output of date to a file so I don't need two files?

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Programming :: Send A Message From IP To Another IP Through Command Prompt?

May 24, 2010

I want to send a message from IP to Another IP through command prompt. how can i do this.s

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Programming :: TCL / Expect - IF Results Are Different Then Send A Command?

Dec 11, 2010

trying to see IF i dont get the right results repeat the command until it will or quit after 3 tries....

expect -exact "->"
send -- "test_read_register 0,0x37
if {! [regexp {Address 0x00000000} do send -- "test_read_register 0,0x37


It should read

Read: Address 0x00000037, Data: 0x0000000b

but sometimes it comes out to this

Read: Address 0x00000000, Data: 0x00000000

therefore ill have to run the command again IF I Dont get the right results...

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Programming :: Streamout Command To RS232 - Send Something Through Serial Port?

Aug 5, 2010

I want to send something through the serial port, for example


the point here is send some numbers to a couple of 7 seg displays, so I will wire a RS232 chip on a protoboard, the logic after the RS232 is not an issue, but how can I assure the data is being sent right from my linux box to the RS232 chip, the one on the protoboard? Do I have to write a C program to read the strings and then send them to the serial port?For example if I wanted to send this to the displays:


So I guess the simplest way is (Supposing I can deal with the stream so it is filtered and only display the number array) $ ifstat > /dev/ttyS0 But, how do I know if the RS232 will take them as the right characters?

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Programming :: Using Sed To Modify Command Output?

Jun 13, 2010

The output of a command changed and I need to extract the data and print it out in a different fassion:

abcd1=aaaa xx
abcd 2 aaa xx bbb
abcd2=aaaa xy
ab 2 xx aaa bbb ccc xxx
should be transformed to:


Currently I used sed "search1|search2|search3" to get the lines that need to be transformed. But I also need to search for substrings in those lines and I need to print those substrings in a specific order together with other characters. How is this done with sed?

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General :: Unix Command To Send File To Printer?

Mar 28, 2010

Is it true that the UNIX commands to send a file to a printer for printing are system-dependent?

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General :: Send A File From One Computer To Another By Command Line?

Jan 27, 2010

I've got a Debian Squeeze computer on which the graphics have packed up, but the terminal in single user mode work perfectly fine.

There are a few files on this Debian computer that I want to transfer off, to a networked computer, but I have no idea how to do this.

The destination computer is a freshly re-setup Mandriva install, without (as yet) samba. I don't think it's necessary though. The Mandriva install works fine, has graphics, etc, but can't see the Debian Squeeze computer on the network, possibly because it's in single user mode, thus prompting the problem of how to transfer the files, using only a command line.

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Programming :: Echo Two Command Output In The Same Line?

Jan 25, 2011

I try to write script and echo two command at the same line .

echo "A"
echo "B"

How can I pipe above two command at the same line in text file . So, in the output text file , you can see below ? Code: A B not Code: A B

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Programming :: Diverting IDL Output To The Command Line?

Jul 14, 2010

I'm troubleshooting a batch of scripts I'm modifying, including an IDL script called by a .csh script. the IDL scripts were provided to me by a coworker and my .csh script is intended to automate a lengthy set of extremely tedious and time consuming processing tasks.

I am currently in the process of debugging, and can't get the IDL to print any messages other than critical failures to the screen. Is there any easy way to redirect the stdout to either a logfile or the screen?

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Programming :: Giving Output Of A Command As The Input To Another

Sep 7, 2010

While making a shell ,there is the following problem Im facing:

I am expecting the user to enter commands in the following format :

I am to separate these and the output of ls -l should be given as input to grep and the output of both to more.

But I am allowed (by our instructor) to use dup/dup2 or any other command(but not pipe or tees).

How to connect the file descriptors after successful execution of each command?

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Programming :: Get String From System Command Output ?

May 15, 2010

I have found this from a site [url]


But it does not work for me, segfault.

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