Login or Register to Ask a Question and Join Our Community


UNIX for Dummies Questions & Answers

Help with commands

 
Thread Tools Search this Thread
Top Forums UNIX for Dummies Questions & Answers Help with commands
# 1  
Old 09-04-2012
Help with commands
Hi again guys, today i bring to you new doubts, let me show the first example
Code:
#!/bin/bash
# ligass: lista archivos que son enlace simbólico o tienen enlaces hard
# simbólicos: en ls -l se busca que empiece con l
if [ ! -d $1 ]
then
  echo Error: ligas: $1 no es un directorio
  exit

Moderator's Comments:
Mod Comment code tags please

On the line of condition i can't figure out which is the function of $1, when, and for what i can use it.

other example.
Code:
TARGET=$1
DAYS=$2
SUBJECT=$3

Any one who has patience to explain to me?
Thanks
# 2  
Old 09-04-2012
Are you passing any variable to the scripts...??

such as...

Code:
sh script.sh 54

In above example $1 = 54, same as if you have passed more than one variable it will be named as $2, $3 and so on....
This User Gave Thanks to pamu For This Post:
Newer
# 3  
Old 09-04-2012
You have a script - call it: script.sh.

When you type the name of the script you feed it extra words, called parameters.
The first one is $1, the second one is $2, so the third one is ??
Code:
#!/bin/bash
# myscript.sh
echo " \$1 is $1"
echo " \$2 is $2"

run the script
Code:
> ./myscript.sh dog cat
 $1 is dog
 $2 is cat
>

This User Gave Thanks to jim mcnamara For This Post:
Newer
# 4  
Old 09-04-2012
Bug Pamu and Jim
Guys thanks a lot again, i'm learning to much with you, now, i have a question for you, if my script didn't have parameters; which will be de value of $1?
# 5  
Old 09-04-2012
Nothing. It will be blank.

You could have easily tried this and seen.
# 6  
Old 09-04-2012
Hammer & Screwdriver Thanks
Perfect, i'll try it!
# 7  
Old 09-05-2012
Next time, find another subject title or you will get an infraction (read the rules again...)
 
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Homework & Coursework Questions

What are the commands for this ?

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted! 1. The problem statement, all variables and given/known data: If the user enters option 1, your program should display the list of entries in the current directory. For... (1 Reply)
Discussion started by: UniverseCloud
1 Replies

2. Shell Programming and Scripting

Ls commands

So I need a way to list all files that contain 4 letters. Also separately I need to find a way to list all files with l or n as the third letter of the name. I need to use the ls command and/or grep/egrep. Any help would be a appreciated. (2 Replies)
Discussion started by: muttfacejohnson
2 Replies

3. UNIX for Dummies Questions & Answers

Vi % commands

How can I find a list of shortcut commands I can execute within vi using the % indicator? For example, I can vi a file, press colon, and then type "%s/\r//g" to remove all instances of a carriage return. What else can be executed from the % prompt and what are the shortcut letters (I could type... (4 Replies)
Discussion started by: MaindotC
4 Replies

4. UNIX for Dummies Questions & Answers

Need help with certain commands

I'm trying to figure out certain commands for these steps. If you wish to discuss with me in real time, PM me your AIM or MSN, thanks. Here are the steps. Edit the readcal_final file Delete all of the lines that comprise the colandar portion of the memo Without leaving vi, open a new... (0 Replies)
Discussion started by: vgmaster9
0 Replies

5. UNIX for Dummies Questions & Answers

help with some commands

Hi! i'd like from someone to explain me 'what is what' from these parts of code if it's possible.i'd like to understand them and their usage: 1) sed '3d' filename 2) sort –t: +0 -1 /etc/passwd and also this: tr ‘’ ‘ ‘ < filename thank you! (11 Replies)
Discussion started by: strawhatluffy
11 Replies

6. AIX

HACMP: difference between 'cl' commands and 'cli' commands

Hi all, I'm new in this forum. I'm looking for the difference between the HACMP commands with the prefix "cl" and "cli". The first type are under /usr/es/sbin/cluster/sbin directory and the second are under /usr/es/sbin/cluster/cspoc directory. I know that the first are called HACMP for AIX... (0 Replies)
Discussion started by: peppix
0 Replies

7. Shell Programming and Scripting

Can BASH execute commands on a remote server when the commands are embedded in shell

I want to log into a remote server transfer over a new config and then backup the existing config, replace with the new config. I am not sure if I can do this with BASH scripting. I have set up password less login by adding my public key to authorized_keys file, it works. I am a little... (1 Reply)
Discussion started by: bash_in_my_head
1 Replies

8. Programming

code that reads commands from the standard i/p and executes the commands

Hello all, i've written a small piece of code that will read commands from standard input and executes the commands. Its working fine and is execting the commands well. Accepting arguments too. e.g #mkdir <name of the directory> The problem is that its not letting me change the directory i.e... (4 Replies)
Discussion started by: Phrozen Smoke
4 Replies

9. Shell Programming and Scripting

commands

anyone know the command to display the ten most common words, together with their number of occurences, in the manual entry for the ls command. It would be much useful (1 Reply)
Discussion started by: master_6ez
1 Replies

10. UNIX for Dummies Questions & Answers

commands

hi, I'm completely new to FreeBds or unix in general, is there a really nice site to teach you the basic ommands to free BSD. I don't know what to do. =( (3 Replies)
Discussion started by: Special K
3 Replies
Login or Register to Ask a Question