python (65.2k questions)

javascript (44.3k questions)

reactjs (22.7k questions)

java (20.8k questions)

c# (17.4k questions)

html (16.3k questions)

r (13.7k questions)

android (13k questions)

Questions - io-redirection

Using execl() for command line with >> redirection

I want to do the linux command echo "text" >> file.txt with C function execl(); I tried execlp("echo","echo", "something" ,">>" ,"tes...
test-img

Mustafa Shama

c

exec

io-redirection

Votes: 0

Answers: 0

File redirection not working when using fork()

I am trying to redirect the output of a command to a file. I've tried this as a standalone thing in main and I had no problem. The output was directed as intended. However, once I throw it into a fork...
test-img

4adelaar

c

fork

io-redirection

Votes: 0

Answers: 1

Latest Answer

Mistakes abound. file_out = open("test.out", O_WRONLY | O_TRUNC | O_CREAT, S_IRUSR | S_IRGRP | S_IWGRP | S_IWUSR); So far, so good. But the next line isn't what's expected. Should b...
test-img

Joshua

Output contents of query to file from within impala-shell

I am trying to extract some information from a Hive table and when I run a describe db.tablename statement within impala-shell, I see that the output is ~2000 lines. How can I extract this information...
test-img

Mortz

impala

io-redirection

Votes: 0

Answers: 1

Latest Answer

I couldn't find a reference to this in the docs, but this works - within impala-shell we can do set output_file=blah.csv; select * from dbname.table_name limit 1000; unset output_file;
test-img

Mortz

Unable to suppress console output from Bash script

Trying to write a bash script to install and configure samba. Have added a control statement to check if samba is already installed. This takes dpkg output and pipes it into grep and checks if output ...
test-img

giorgi

bash

pipe

io-redirection

stderr

Votes: 0

Answers: 0

Posts

Questions

Blogs

Jobs