All Questions
Tagged with cat command-line
20
questions
0
votes
1
answer
91
views
How to get the return value of pipe and executable on Windows
I am running some unit tests which involve piping into my executable, like this.
cat text.txt | my_exe --options
Running these commands, how do I get the return value of my_exe? Even when my_exe ...
- 183
0
votes
1
answer
93
views
Concatenate pairs of mp3 files with ffmpeg or cat?
I've got a directory of mp3 files, which look a little like this:
Blue Elephant part 1.mp3
Blue Elephant part 2.mp3
Tale of Two Cities part 1.mp3
Tale of Two Cities part 2.mp3
Lookism part 1.mp3
...
- 67
1
vote
1
answer
16k
views
cat command with a variable that has spaces
I need to use cat command to display the contents of a file, and the filename has spaces in them: "embedded board link.rtf".
I assign the filename using a variable: I="embedded board link.rtf", but ...
- 5,974
7
votes
7
answers
10k
views
What is the equivalent of Bash's cat -n in PowerShell?
I want to cat a file and output the line number of each line it outputs.
However, in PowerShell, cat outputs an array. Hence the question effectively becomes: How do I print the index of each item ...
- 1,815
0
votes
2
answers
2k
views
What's the behaviour of `cat | less`?
I tried to run the following command:
cat | less
I know both commands require something from the standard input.
When I run it that's what I expected: all my inputs goes to cat and I will not be ...
- 236
0
votes
1
answer
643
views
Piping a line of the file read with while read loop
I am trying to read each line of the file and then assign some parts of it to variables. A line itself is read as a variable so I need to process a variable input say for cat which seems to be ...
- 1
2
votes
2
answers
4k
views
linux cat into file including exiting code all from copy+paste
Can I print out a code to STDOUT that would mimic the behavior of Ctrl+c inside cat? E.g. I would like my script to print out the cat command followed by the content of the file like this:
cat > /...
- 4,457
0
votes
2
answers
2k
views
Execute a command for 3 lines at a time
I'm trying to run three separate processed while reading foo.txt
Here is the example:
cat foo.txt | while read line
do
echo line1
echo line2
echo line3
echo ""
done
The expected output is:
line1
...
- 233
0
votes
1
answer
732
views
How to print statistics from lines in a file
I often find myself computing percentages manually after filtering through a log file to find the proportion of X or Y in it. Can this easily be achieved via common CLI tools?
- 135
0
votes
2
answers
3k
views
Copying a template header to multiple existing files
I have a bunch of *.csv files that use headers. Right now the files have headers and the same number of lines of data. I need to erase the data in these files, so I figured I could just overwrite the ...
- 407
14
votes
4
answers
42k
views
How can I stop cat output immediately despite massive output?
I'm looking for someway to stop the output to STDOUT when I realize a command is wrong. For instance, if I accidentally cat a very large file. Usually it will eventually stop if you hold down ctrl + c,...
- 587
21
votes
7
answers
15k
views
Cat file to terminal at particular speed of lines per second
I'm lazy and I could write a script to do this, but I'm even too lazy to think of how to do it.
I often do things like :
cris$ python runexperiment.py > output.txt
cris$ cat output.txt
...
1
vote
1
answer
249
views
Pass an option syntax string as filename
I somehow got a file named --no-recursion in a directory. How can I get cat to show what it contains? Not like this, since the argument gets interpreted as an option:
root@nagini [/home/lalilulelo]# ...
- 2,117
5
votes
5
answers
16k
views
Concatenating files from multiple subdirectories
Say I have a directory structure that looks like this:
file1.txt
folder1/
file2.txt
folder2/
file3.txt
How can I concatenate file1.txt, file2.txt, and file3.txt into a single file?
Edit: ...
- 1,667
51
votes
8
answers
13k
views
What is the general consensus on "Useless use of cat"?
When I pipe multiple unix commands such as grep, sed, tr etc. I tend to specify the input file that is being processed using cat. So something like cat file | grep ... | awk ... | sed ... .
But ...
- 623