Just calling jq without a filter will throw errors if stdout isn’t a terminal $ curl https://jsonplaceholder.typicode.com/posts/1 | jq > test.txt jq – commandline JSON processor [version 1.5-1-a5b5cbe] Usage: jq [options] <jq filter> [file…] jq is a tool for processing JSON inputs, applying the given filter to its JSON text inputs and producing the […] … Read more
This was not supported in PowerShell v1 [and as of v5, it’s still not…] An example workaround is: Get-Content test.full | .\test_cfdp.exe | tee test.log
Ok, it got a bit ugly, but here is a solution: unset t_std t_err eval “$( (echo std; echo err >&2) \ 2> >(readarray -t t_err; typeset -p t_err) \ > >(readarray -t t_std; typeset -p t_std) )” where (echo std; echo err >&2) needs to be replaced by the actual command. Output of stdout … Read more
By default output to stdout is line-buffered when connected to a terminal. That is, the buffer is flushed when it’s full or when you add a newline. However, if stdout is not connected to a terminal, like what happens when you redirect the output from your program to a file, then stdout becomes fully buffered. … Read more
no need to launch sub shell. Use a code block will do as well. { time ls; } 2> out.txt or { time ls > /dev/null 2>&1 ; } 2> out.txt
This is the same as &>. From the bash manpage: Redirecting Standard Output and Standard Error This construct allows both the standard output (file descriptor 1) and the standard error output (file descriptor 2) to be redirected to the file whose name is the expansion of word. There are two formats for redirecting standard output … Read more
The simple naive way that is slow because it opens and positions the file pointer to End-Of-File multiple times. @echo off command1 >output.txt command2 >>output.txt … commandN >>output.txt A better way – easier to write, and faster because the file is opened and positioned only once. @echo off >output.txt ( command1 command2 … commandN ) … Read more
I just did some tests of the four options that I know about. Measure-Command {$(1..1000) | Out-Null} TotalMilliseconds : 76.211 Measure-Command {[Void]$(1..1000)} TotalMilliseconds : 0.217 Measure-Command {$(1..1000) > $null} TotalMilliseconds : 0.2478 Measure-Command {$null = $(1..1000)} TotalMilliseconds : 0.2122 ## Control, times vary from 0.21 to 0.24 Measure-Command {$(1..1000)} TotalMilliseconds : 0.2141 So I would … Read more
You can use one-line heredoc cat <<< “This is coming from the stdin” the above is the same as cat <<EOF This is coming from the stdin EOF or you can redirect output from a command, like diff <(ls /bin) <(ls /usr/bin) or you can read as while read line do echo =$line= done < … Read more
If you want to log to the same file: command1 >> log_file 2>&1 If you want different files: command1 >> log_file 2>> err_file