All Questions
42
questions
2
votes
1
answer
212
views
cat files based on substring match
I have file names in the following format and I would like to cat files based on substring match(Orange,Apple) and a constant(S4,S5),
file names example _S6_trimmed_, _S8_trimmed_, _S9_trimmed_, ...
- 33
2
votes
0
answers
44
views
Cat with gun parallel does not continue as expected
Here is my code.
file_name="all_parts"
find parts/ -type f > ${file_name}
while read part
do
echo processing ${part}
cat ${part} | parallel -j 100 'wget {} -o logs/...
- 21
0
votes
1
answer
83
views
Set default editor [duplicate]
I would like to configure a program named howdy which allows you to login using your face.
For this I need to edit the config file to add the path to my camera.
However when I execute sudo howdy ...
2
votes
1
answer
1k
views
concatening a variable to a file using cat
I wanted to do a bash function that given a text variable, it would concatenate it to a file. i.e
function print() {
cat << 'EOF' >> file
This $1 is a variable
EOF
}
But it wouldnt work. ...
- 23
0
votes
1
answer
33
views
How to add a counter starting from a number other than 1?
I have a file where I need to add 200 more lines, but I'd like to know how to renumber them automatically. The file has the following structure:
col1\tcol2\tdb4444\tcol4\tcol5\tcol6\tcol7\tcol8\tcol9\...
- 11
6
votes
1
answer
3k
views
Cat hangs when attempting to read empty STDIN
My script attempts to gather information that may or may not be present in STDIN at execution time, but cat hangs if the pipe is empty. How can I ensure that my script skips this step if this there is ...
- 163
1
vote
2
answers
6k
views
select columns on cat command
I use a file as a little db table. The content is like this:
client1 john doe engineer cal
client2 jane doe nurse ny
client3 ali veli doctor ny
I want to find ...
- 805
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
1
vote
1
answer
597
views
echo stdin, unless empty, in which case cat a file
The pipeline fstdraw in.fst | dot -Tpng | convert - -rotate 90 out.png converts a file in a certain binary format into a PNG image.
Unfortunately, in some cases fstdraw emits zero bytes. (A bug in ...
- 2,521
4
votes
2
answers
11k
views
Piping commands into nc
I've seemingly searched many very similar questions but never quite found something to work. I'm trying to use a raspberry pi (2nd gen) to communicate with a Wifi OBDII sensor. I'm able to use the ...
- 41
1
vote
1
answer
460
views
cat files from pipe
I have to join files to one original file, which was split. There is a catalog, in which there are a lot of files,but no every is necessary. I have file with md5sum, which contain md5sum files I have ...
- 907
0
votes
1
answer
311
views
/usr/bin/mail not interpreting new lines
I have a strange problem when piping a cat to mail.
I have a simple text file which has been compiled from a script, which is a report on what folders were copied in the script. I then want to send ...
- 321
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