All Questions
8 questions
-1
votes
2
answers
322
views
using awk to print if any three variables are true
I want the code print if any of these variables are true.
this is not my real code, it's just an example
read -p "enter protocol: " protocol
read -p "enter src ip: " srcip
read -p &...
- 29
1
vote
0
answers
194
views
Two lines are removed with sed instead of one, why? [duplicate]
I am attempting to remove lines from this text file (foo.txt):
cat
mouse
animals: 2
I want to remove the two lines from the end:
animals: 2
So I end up with this:
cat
mouse
However, when using ...
- 373
2
votes
1
answer
9k
views
How to read a file with two columns into a script so that each line read as two variables
I have a file that has two columns like such.
cat test.txt
100 2007
FFF 1993
7E7 1994
4BB 1995
I need to input each of the lines into a script, and have the two columns assigned as separate ...
- 123
4
votes
4
answers
7k
views
How to allow only certain characters in a bash variable
I want to prompt the user to input a URL, but it can only contain A-Z, a-z, 0-9, &, ., /, =, _, -, :, and ?.
So, for example:
Enter URL:
$ http://youtube.com/watch?v=1234df_AQ-x
That URL is ...
- 373
0
votes
3
answers
4k
views
Map string from var1 to var2 (lookup)
I want to do case insensitive lookup on VAR2 based on the content of VAR1 that holds some parameters in the form key:value. If a VAR1 key is present replace the value in VAR2.
For example for:
VAR1=...
- 1,395
2
votes
1
answer
1k
views
How can one prepend text to each line of a multi-line variable?
I print all the variables with there values
echo "$val"
mapreduce.map.memory.mb,3584
mapreduce.map.java.opts,-Xmx2560m
mapreduce.reduce.memory.mb,3584
mapreduce.reduce.java.opts,-Xmx2560m
...
- 13.9k
3
votes
2
answers
1k
views
Changing a number in a string of numbers
I'm trying to write a function that will let me change a number in a list of numbers based on a position. For example, I want to be able to change the fourth number in the list 10.90.123.80.42 to 19 ...
- 33
0
votes
1
answer
2k
views
Creating a file and replacing variables in bash
Background:
I created a VPN service for myself. I have a lot of time on my hands and I enjoy the challenge of creating "business like" services, so I can kind of create a portfolio for myself. I ...
- 9