How to remove double-quotes in jq output for parsing json files in bash?
I'm using jq to parse a JSON file as shown here. However, the results for string values contain the "double-quotes" as expected, as shown below: $ cat json.txt | jq '.name' "Google" How can I pipe this into another command to remove the ""? so I get $ cat json.txt | jq '.name' | some_other_command Google What some_other_command can I use?
What's the difference between `-rpath-link` and `-L`?
Here is a demo, for GNU ld, of the difference between -L and -rpath-link - and for good measure, the difference between -rpath-link and -rpath. foo.c #include <stdio.h> void foo(void) { puts(__func__); } bar.c #include <stdio.h> void bar(void) { puts(__func__); } foobar.c extern void foo(void); extern void bar(void); void foobar(void) { foo(); bar(); } main.c extern void foobar(void); int main(voi
What is the theoretical maximum number of open TCP connections that a modern Linux box can have
Assuming infinite performance from hardware, can a Linux box support >65536 open TCP connections? I understand that the number of ephemeral ports (<65536) limits the number of connections from one local IP to one port on one remote IP. The tuple (local ip, local port, remote ip, remote port) is what uniquely defines a TCP connection; does this imply that more than 65K connections can be supported
Hexadecimal To Decimal in Shell Script
Can someone help me to convert a hexadecimal number to decimal number in a shell script? E.g., I want to convert the hexadecimal number bfca3000 to decimal using a shell script. I basically want the difference of two hexadecimal numbers. My code is: var3=`echo "ibase=16; $var1" | bc` var4=`echo "ibase=16; $var2" | bc` var5=$(($var4-$var3)) # [Line 48] When executing, I get this error: Line 48: -:
How to run test cases in a specified file?
There are two ways. The easy one is to use the -run flag and provide a pattern matching names of the tests you want to run. Example: $ go test packageName -run NameOfTest See the docs for more info. Note that the -run flag may also run other tests if they contain the string NameOfTest, as the -run flag matches a regexp. So to ensure that only a test named exactly 'NameOfTest' is run, one has to us
Why is #!/usr/bin/env bash superior to #!/bin/bash?
I've seen in a number of places, including recommendations on this site (What is the preferred Bash shebang?), to use #!/usr/bin/env bash in preference to #!/bin/bash. I've even seen one enterprising individual suggest using #!/bin/bash was wrong and bash functionality would be lost by doing so. All that said, I use bash in a tightly controlled test environment where every drive in circulation is
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