Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Passing arguments to a bash script
Top Forums Shell Programming and Scripting Passing arguments to a bash script Post 302905325 by Don Cragun on Wednesday 11th of June 2014 03:53:23 AM
Old 06-11-2014
In addition to what Scrutinizer said, the following:
Code:
a = CREATE TABLE mytable(x int, y string);

is not a valid awk command. And, you will be executing this invalid command once for every line in both input files. To get the output you say you want, awk is an extremely expensive way to do it, but it could be done with something like:
Code:
awk -F, -v mytable="$1" '
BEGIN { printf("a = CREATE TABLE %s(x int, y string);\n", mytable)}
{       # ignore every line in both input files.}' file[12].txt

To get this output in bash (or any other shell that recognizes basic Bourne shell syntax), a much more efficient way to do it would be:
Code:
printf 'a = CREATE TABLE %s(x int, y string);\n' "$1"

Note that ShriniShoo's awk script sets the awk variable a to part of the desired output every time it reads a line from either file, but never does anything with it. That script produces no output.

Using echo instead of printf (as sea suggested) may have unwanted side effects if the user supplied argument to your script contains any backslash characters (depending on which version of echo you're using).
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Passing arguments to a script

I've written a script (bgrep) for a more advanced grep command (& attached a cut down version below). I'm trying allow all grep options to be used, or in any combination. The script works fine if I type say bgrep -i -files product it will return a non-case sensitive list of matches for... (3 Replies)
Discussion started by: Kevin Pryke
3 Replies

2. Shell Programming and Scripting

Passing arguments to a Perl script

I am playing around with Perl and wrote the script below that is executed from the command line, it will split data up in a file based on a value supplied. When executed you provide two arguments - the file that contains the data to be split and the character you want to split by. It works as... (4 Replies)
Discussion started by: jyoung
4 Replies

3. UNIX for Advanced & Expert Users

Passing blank arguments to a script

All, I have a cron job script that receives several command line arguments. At some point if there are validation problems and the job cannot be run, it duplicates the entire command line into a temporary text file which is later executed as a script. Unfortunately when I pass the list of received... (7 Replies)
Discussion started by: rm-r
7 Replies

4. Shell Programming and Scripting

problem passing arguments to script

Hi, I am writing a script, which is invoked from other system using ssh. I have problems reading the arguments passing to the script. If the argument has a space in it (ex "rev 2.00"), the script considers "rev" as 1 argument and "2.00" as another. Instead i want "rev 2.00" to be considered... (5 Replies)
Discussion started by: cjjoy
5 Replies

5. Shell Programming and Scripting

passing arguments to sql script

Hi Gurus, i have one requirement in unix script, i have a file called abc.txt in that few lines are there with the empid, i need to read each line and pass to .sql script. ex: abc.txt 2345 2346 1243 1234 i need to pass these arguments to .sql script rom unix ex: select * from... (1 Reply)
Discussion started by: Devendar
1 Replies

6. Shell Programming and Scripting

passing arguments to external script

Hi! I have a python script that requires arguments and these arguments are file paths. This script works fine when executed like this: /my_python_script "file_path1" "file_path2" (i added quotes as some file names may have weird characters) the issue happens when i launch my python script... (14 Replies)
Discussion started by: gigagigosu
14 Replies

7. Shell Programming and Scripting

Passing arguments from a bash shell script to a command

I'm pretty new to bash scripting and I've found myself writing things like this (and the same with even more nesting): if $CATEGORIES; then if $LABEL_SLOTS; then $pyth "$wd/texify_grammar.py" "$input" "$texfile" "--label-slots" "--categories" "$CATEGORY_LIST" ... (9 Replies)
Discussion started by: burbly
9 Replies

8. Shell Programming and Scripting

Passing arguments to interactive program through bash script, here document

Dear Users, I have installed a standalone program to do multiple sequence alignment which takes user parameters to run the program. I have multiple sequence files and want to automate this process through a bash script. I have tried to write a small bash code but its throwing errors. Kindly... (13 Replies)
Discussion started by: biochemist
13 Replies

9. Shell Programming and Scripting

Passing arguments to php script

i want to be able to pass arguments to a php script if it is being piped: cat myphpscript.php | php - $1 $2 $3 blah blah This usually works for other script languages...i.e. ruby: cat myrubyscript.rb | ruby - $1 $2 $3 blah blah so my question is, how can i pass arguments to my php... (1 Reply)
Discussion started by: SkySmart
1 Replies

10. UNIX for Beginners Questions & Answers

Beginner at bash scripting - need help with passing arguments

I at the moment, making a simple bash script, capable of setting up an workspace for me, so i don't have to do it manually.. Problem is though i can't seem to provide the bash script any argument, without running into my error checks, checking for input... Here is the code: #!/bin/bash... (7 Replies)
Discussion started by: kidi
7 Replies

LEARN ABOUT LINUX

rbash

RBASH(1)						      General Commands Manual							  RBASH(1)

NAME

       rbash - restricted bash, see bash(1)

RESTRICTED SHELL

       If  bash  is  started with the name rbash, or the -r option is supplied at invocation, the shell becomes restricted.  A restricted shell is
       used to set up an environment more controlled than the standard shell.  It behaves identically to bash with the exception that the  follow-
       ing are disallowed or not performed:

       o      changing directories with cd

       o      setting or unsetting the values of SHELL, PATH, ENV, or BASH_ENV

       o      specifying command names containing /

       o      specifying a file name containing a / as an argument to the .  builtin command

       o      specifying a filename containing a slash as an argument to the -p option to the hash builtin command

       o      importing function definitions from the shell environment at startup

       o      parsing the value of SHELLOPTS from the shell environment at startup

       o      redirecting output using the >, >|, <>, >&, &>, and >> redirection operators

       o      using the exec builtin command to replace the shell with another command

       o      adding or deleting builtin commands with the -f and -d options to the enable builtin command

       o      using the enable builtin command to enable disabled shell builtins

       o      specifying the -p option to the command builtin command

       o      turning off restricted mode with set +r or set +o restricted.

       These restrictions are enforced after any startup files are read.

       When a command that is found to be a shell script is executed, rbash turns off any restrictions in the shell spawned to execute the script.

SEE ALSO

       bash(1)

GNU Bash-4.0							    2004 Apr 20 							  RBASH(1)
All times are GMT -4. The time now is 09:54 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy