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Ubuntu - “sudo iptables” command works in terminal, doesn't work in bash script

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1

I'm using a simple terminal command that adds a rule to iptables and it executes without problems:

sudo iptables -A OUTPUT -p tcp -m string --string "facebook.com" --algo kmp -j REJECT

When I run that command in a bash script, it returns sudo: ./script.sh: command not found

The script looks like this:

#!/bin/bash

sudo iptables -A OUTPUT -p tcp -m string --string "facebook.com" --algo kmp -j REJECT

linux scripting sudo

share|improve this question

edited Mar 31 at 13:57

Jeff Schaller♦

45k1164147

asked Mar 31 at 12:45

Marin LeontenkoMarin Leontenko

142

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Is script.sh executable? chmod +x script.sh
  
  – Thomas
  Mar 31 at 13:10
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Apparently it wasn't. It works after I changed permission. I thought all scripts are executable by default. Thanks!
  
  – Marin Leontenko
  Mar 31 at 13:19
  
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @MarinLeontenko a script is just another file. By that logic, all files would be executable by default.
  
  – multithr3at3d
  Mar 31 at 14:50
  

  
  
  
  

add a comment | 

1

I'm using a simple terminal command that adds a rule to iptables and it executes without problems:

sudo iptables -A OUTPUT -p tcp -m string --string "facebook.com" --algo kmp -j REJECT

When I run that command in a bash script, it returns sudo: ./script.sh: command not found

The script looks like this:

#!/bin/bash

sudo iptables -A OUTPUT -p tcp -m string --string "facebook.com" --algo kmp -j REJECT

linux scripting sudo

share|improve this question

edited Mar 31 at 13:57

Jeff Schaller♦

45k1164147

asked Mar 31 at 12:45

Marin LeontenkoMarin Leontenko

142

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Is script.sh executable? chmod +x script.sh
  
  – Thomas
  Mar 31 at 13:10
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Apparently it wasn't. It works after I changed permission. I thought all scripts are executable by default. Thanks!
  
  – Marin Leontenko
  Mar 31 at 13:19
  
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @MarinLeontenko a script is just another file. By that logic, all files would be executable by default.
  
  – multithr3at3d
  Mar 31 at 14:50
  

  
  
  
  

add a comment | 

I'm using a simple terminal command that adds a rule to iptables and it executes without problems:

sudo iptables -A OUTPUT -p tcp -m string --string "facebook.com" --algo kmp -j REJECT

When I run that command in a bash script, it returns sudo: ./script.sh: command not found

The script looks like this:

#!/bin/bash

sudo iptables -A OUTPUT -p tcp -m string --string "facebook.com" --algo kmp -j REJECT

linux scripting sudo

share|improve this question

edited Mar 31 at 13:57

Jeff Schaller♦

45k1164147

asked Mar 31 at 12:45

Marin LeontenkoMarin Leontenko

142

#!/bin/bash

sudo iptables -A OUTPUT -p tcp -m string --string "facebook.com" --algo kmp -j REJECT

share|improve this question

edited Mar 31 at 13:57

Jeff Schaller♦

45k1164147

asked Mar 31 at 12:45

Marin LeontenkoMarin Leontenko

142

share|improve this question

edited Mar 31 at 13:57

Jeff Schaller♦

45k1164147

asked Mar 31 at 12:45

Marin LeontenkoMarin Leontenko

142

edited Mar 31 at 13:57

Jeff Schaller♦

45k1164147

edited Mar 31 at 13:57

Jeff Schaller♦

45k1164147

asked Mar 31 at 12:45

Marin LeontenkoMarin Leontenko

142

asked Mar 31 at 12:45

Marin LeontenkoMarin Leontenko

142

1 Answer
1

active

oldest

votes

5

If a script is not executable, one has to call it with an appropriate shell like /bin/sh or /bin/bash. This will ignore the shebang line and the script will be executed with the calling shell.

sudo /bin/sh ./script.sh

To run the script as inteded by OP you have to give the script execution rights.

chmod +x script.sh
sudo ./script.sh

In this case the script is executed with the shell of the shebang line.

share|improve this answer

answered Mar 31 at 14:10

ThomasThomas

4,14361430

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I believe that you can also use . <scriptname> to run it in the currently running shell. That is how I executed scripts back in the day on my dialup Unix shell.
  
  – trlkly
  Mar 31 at 20:15
  

  
  
  
  

add a comment | 

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5

If a script is not executable, one has to call it with an appropriate shell like /bin/sh or /bin/bash. This will ignore the shebang line and the script will be executed with the calling shell.

sudo /bin/sh ./script.sh

To run the script as inteded by OP you have to give the script execution rights.

chmod +x script.sh
sudo ./script.sh

In this case the script is executed with the shell of the shebang line.

share|improve this answer

answered Mar 31 at 14:10

ThomasThomas

4,14361430

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I believe that you can also use . <scriptname> to run it in the currently running shell. That is how I executed scripts back in the day on my dialup Unix shell.
  
  – trlkly
  Mar 31 at 20:15
  

  
  
  
  

add a comment | 

5

If a script is not executable, one has to call it with an appropriate shell like /bin/sh or /bin/bash. This will ignore the shebang line and the script will be executed with the calling shell.

sudo /bin/sh ./script.sh

To run the script as inteded by OP you have to give the script execution rights.

chmod +x script.sh
sudo ./script.sh

In this case the script is executed with the shell of the shebang line.

share|improve this answer

answered Mar 31 at 14:10

ThomasThomas

4,14361430

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I believe that you can also use . <scriptname> to run it in the currently running shell. That is how I executed scripts back in the day on my dialup Unix shell.
  
  – trlkly
  Mar 31 at 20:15
  

  
  
  
  

add a comment | 

If a script is not executable, one has to call it with an appropriate shell like /bin/sh or /bin/bash. This will ignore the shebang line and the script will be executed with the calling shell.

sudo /bin/sh ./script.sh

To run the script as inteded by OP you have to give the script execution rights.

chmod +x script.sh
sudo ./script.sh

In this case the script is executed with the shell of the shebang line.

share|improve this answer

answered Mar 31 at 14:10

ThomasThomas

4,14361430

sudo /bin/sh ./script.sh

chmod +x script.sh
sudo ./script.sh

share|improve this answer

answered Mar 31 at 14:10

ThomasThomas

4,14361430

answered Mar 31 at 14:10

ThomasThomas

4,14361430

answered Mar 31 at 14:10

ThomasThomas

4,14361430