1. Shell Programming and Scripting

Hi, I have a script as follows: #!/bin/sh nohup ./my_program >& /dev/null & However, i get a "Generated or received a file descriptor number that is not valid" whenever I run it. running the command up in prompt is ok though. if i change the first line to #!/bin/csh i get a then:... (4 Replies)

2. Programming

To implement the facility of piping and redirection I used the two commands dup, dup2, and strtok for tokenizing the command. But when I run the command ls|more it is not running fine as I have developed it using the dup2 command. the more command needs the whole buffer at once. Please help... (7 Replies)

3. Programming

Hi, To explain this question I will have to go into a bit of detail. I hope you don't mind. currently I have a log handler (an already compiled c++ version) and what it does is makes a log file and writes all the unix output (echo, etc) of a script to that log file. To me the log_handler is... (3 Replies)

4. UNIX for Dummies Questions & Answers

i am using 2> to redirect all the standard errors that i get in my bash script.. this command needs to be given in all the statements for which the errors are to redirected.. is there a command that will catch all the errors in all the shell commands that are present inside a script .? pls help.. (7 Replies)

5. Shell Programming and Scripting

My script is throwing the error 'Syntax error: redirection unexpected' My line of code.. cat nsstatustest.html | sed s/<tr><td align="left">/<tr><td align="left" bgcolor="#000000"><font color="white">/ > ztmp.Ps23zp2s.2-Fpps3-wmmm0dss3 HTML tags are getting in the way but they're needed to... (3 Replies)

6. Programming

sorry im very new to this but i am supposed to create 3 processes A,B, and C and have a direct link from a to b, b to c, and c to a. here is my code. It does work, however if you look at what I bolded as long as my final read is p it seems to always work, regardless of the bolded section. ... (6 Replies)

7. Shell Programming and Scripting

hi :) if condition >&- 2>&- Can anybody explain the redirection in above command Thanks in advance (1 Reply)

8. Shell Programming and Scripting

I'm trying to find average of values in 2nd column in some files. Filenames have following pattern eg: tau_2.54_even_v1.xls tau_2.54_odd_v1.xls tau_1.60_v1.xls tau_800_v1.xls #!/bin/bash for file in pmb_mpi tau xhpl mpi_tile_io fftw ; do for f in "2.54" "1.60" "800" ;do if... (2 Replies)

9. Shell Programming and Scripting

Hi i am facing a very strange problem suppose the parameters which i passed to the script is -o 140 then my code is as follows echo $* | awk '{ for ( i=0;i<=NF;i++){if ($i= -o) { print ${i+1} } } ' | read abc echo $abc abc=`echo $* | awk '{ for ( i=0;i<=NF;i++){if ($i= -o) { print... (5 Replies)

10. Shell Programming and Scripting

I have a script which outputs some timing data a line at a time. There are approx. 10 lines echoed, each line looks something like this: 0.741 http://checkip.dyndns.org 94.170.119.226Since I needed to add all the values in the first column, I piped the output to grep, matching and printing the... (7 Replies)