When I try and save the file to hosts2.yml, it looks like echo is printing to STDOUT. Is there anyway to pass the result of echo to awk, or maybe a better way to do this?
When I try and save the file to hosts2.yml, it looks like echo is printing to STDOUT. Is there anyway to pass the result of echo to awk, or maybe a better way to do this?
You can make awk print the text instead of using the echo-keyword. The BEGIN-clause in awk is for that: whatever is in the BEGIN clause is executed before any text from the input file is processed:
This should do the same as the construct with echo. Furthermore, a little hint: if you connect two commands (like the awk and the echo) with the && operator you effectively say: execute the second command only if the first command exits without error.
This can make sense if the second command really depends on the successful execution of the first. But even in this case it is clearer to write it in long form:
Code:
if command1 ; then
command2
else
echo "something went wrong with command 1"
fi
instead of the (basically equivalent but less readable)
Code:
command1 && command2 || echo "something went wrong with command 1"
In case of awk and echo it doesn't make any sense because, honestly, how is echo supposed to not succeed?
Note I added 'hi there', should be something else.
If you run a series of commands as a child process and save the all the outputs to a variable, stdout gets written to that variable.
There are other ways to do this, as a matter of taste or readability of code.
As was said earlier, an unconditional ; is simpler than the &&.
The command group is smarter than a ( command1; command2 ) sub shell.
Note that the command group requires a ; or a newline before the closing } - while the sub shell does not require it before the closing ).
BTW, in the previous post the $( ) is a sub shell, too. But all the output is stored in a variable aka memory first - this is far from being efficient.
Hello,
I've been trying to find the answer to this with Google and trying to browse the forums, but I haven't been able to come up with anything. If this has already been answered, please link me to the thread as I can't find it.
I've been asked to write a script that pulls a list of our CPE... (51 Replies)
I am trying to modify the "corestat v1.1" code which is in Perl.The typical output of this code is below:
Core Utilization
CoreId %Usr %Sys %Total
------ ----- ----- ------
5 4.91 0.01 4.92
6 0.06 ... (0 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
Hi there.
i have created a program that in the end it will give output like this
1 2 3 4 5
10 9 ... (1 Reply)
Stumped with the formatting of the awk output when used with variables, e.g.:
awk -F, 'BEGIN {OFS=","} print {$2,$3,$4}' $infile1
produces the desired output (with rows), but when echoing the variable below, the output is one continuous line
var1=$(awk -F, 'BEGIN {OFS=","} print... (4 Replies)
Hello all,
I wrote this command line for some calculation on my given input files based on another input file which is a txt file.
while read BAM REGION; do samtools view $BAM $REGION | awk '{if ($2==0) print $0}' | wc -l >>log.txt; echo "$REGION"; done >> log.txt <regions.txt
It takes... (4 Replies)
Can any one please help, the code works...I want the output of $result to be saved in an output.txt file which is lcoated in c:\\temp\\output.txt.
$filepath="C:\\temp\\ip.txt";
open (HOSTLIST,"$filepath");
@hosts=(<HOSTLIST>);
foreach $host(@hosts)
{
$results = `nslookup... (1 Reply)
Does anybody know any alternative way to save output result of a program into another new file?
I got try the command below:
program_used input_file > new_output_file
program_used input_file >> new_output_file
Unfortunately, both the ">" and ">>" is not work at this case to save the output... (6 Replies)
hi there !
i have exactly the same problem like this guy here
https://www.unix.com/shell-programming-scripting/127668-getting-curl-output-verbose-file.html
i am not able to save the curl verbose output..
the sollution in this thread (redirecting stderr to a file) does not work for me.... (0 Replies)
hello hackers.
i have a curl process running as cgi directly pushing stdout to the client. but i want to additionally save that stream to a file at the same time.
any directions madly welcome.
thanks in advance (3 Replies)
I have a window open on my ultra 10 - a terminal window connecting to a server.
Is there any way I can log all output to this window to a log file on my ultra 10 ? (2 Replies)
