This question already has answers here:
How to extract date from filename with extenstion using shell script
(2 answers)
Closed 9 months ago.
Here I print the file,
cat testfile.txt
demo_test_file_2022-06-06
i need a output like this
demo_test_file_ 2022-06-06
please help me for splitting the line when numbers present in Linux
thanks in advance
You need to read that file line-by-line into an std::string variable, then use find_first_of to find the first digit.
Then use substr
Related
This question already has answers here:
How can I remove all text after a character in bash?
(7 answers)
Closed last month.
Working on a script where I need to take a string, and remove everything after the last occurence of a certain character. In this case a hyphen.
For example, This-is-a-filename-0001.jpg should result in This-is-a-filename
You can cut strings in bash:
line="This-is-a-filename-0001.jpg"
echo "${line%-*}" # prints: This-is-a-filename
The %-*operator removes all beginning with the last hyphen.
You're looking for a sed within your script, something close to what's below.
sed 's!/[^/]*$!/!'
Generally, I would say, please do research before posting a question like yours since it's relatively easy to find the answers
This question already has answers here:
How to get a substring after the last underscore (_) in unix shell script
(3 answers)
Closed 3 years ago.
I have a string like:
arn:aws:ecs:us-east-1:123456789:task-definition/myservice:10
Is there anyway I can get the last value 10? I tried to get last character but forgot that this int value can increase and eventually becomes 2 characters.
Well, many ways, this one works, though is not elegant :)
echo "arn:aws:ecs:us-east-1:123456789:task-definition/myservice:10" | sed 's/.*://'
This question already has answers here:
What's the magic of "-" (a dash) in command-line parameters?
(5 answers)
Closed 5 years ago.
I saw this line of code the other day and I didn't know exactly what is this - or when to use it. This is a simple code and from what I understood is that - takes the piped output and treats it as an argument of paste (correct me if I'am wrong)
seq $size | paste - $file
My question is when can we use this and is there another way to do the same thing?
Thanks,
This is documented in the man page for paste which says:
With no FILE, or when FILE is -, read standard input.
That is, paste expects you to give it a filename, but you can instead give it a single - instead, which paste will interpret as it should read data from stdin , your pipe in this case, instead of opening a file and read data from that file.
This question already has answers here:
How to preserve line breaks when storing command output to a variable?
(2 answers)
Closed 7 years ago.
If I grep our syslogs for a specific term, I get a nice output of those logs matching my term and each entry on a separate line.
If I save that to a variable so I can use it in a script as such:
results=$( grep "term" logs )
echo $results
then all the logs run together and are not human readable.
How can I make it look cleaner so when I do echo $results, I can actually read the output?
Thanks,
Quote it:
echo "$results"
This preserves all the whitespace, instead of using it for word splitting.
In general, you should almost always quote variables, unless you have a specific reason not to.
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Python: Split string with multiple delimiters
Convert django Charfield â\tâ to tab
I have written a python code in Eclipse which takes delimiters as an argument. When I do
print "Hello",delimiter, "All".
This generates --> Hello \t All, whereas if I overwrite the delimiter with delimiter = '\t' within the code, I get the right output Hello All. I wonder what is the difference? I hope this not just the eclipse thing.
The problem is that what is being passed in from the command line is actually a string of length two "\\t" and not a tab character. You can do the following to your delimiter
delimiter.decode("string_escape"))
that should convert the string '\\t' into '\t'. The answer comes from a duplicate questions here