I have a roles.txt file that contains SELECT ROLE_NAME FROM SENTRY_ROLE WHERE ROLE_NAME produces: Im trying to echo all the roles from roles.txt that are not in the sql_output (user in this example). This is what i have so far: Answer That’s not how you iterate over the lines of a file. See http://mywik…
Insert text if column contains a number
I have a tab-delim file that looks like this It should be three columns but some rows are missing the second column (bacterial taxonomy). For these rows I want to move the number to a third column and insert some text (such as Unclassified). I have been attempting to modify some commands I found online to ins…
How to do parsing of Elapsed time in seconds in linux
I want to do parsing of Elapsed time in seconds .Time formats given below: i’m getting values from systemctl status cassandra | awk ‘/(Active: active)/{print $9, $10,$11}’ Now storing it’s value in variable A,like now A has input as 3 day 18h or 3 day etc. More examples- A=3 day 18h or…
How to cut string between two search patterns(including search patterns) from a file?
I have a file called applications.txt which contains the following data : The strings in this file contain hostnames which I would like to display as follows : Few of the above servers are UAT and few are PROD servers. As you see the host-names are sandwiched between two patterns: First pattern is -x (lowerca…
How to pass additional arguments for docker daemon
I have under /etc/sysconfig/docker , the following configuration :- Now I am using docker version 17.03.1-ce on Red Hat Enterprise Linux Server release 7.4 and default storage driver as overlay that is causing lot of build issues due to :- After doing a bit of research on the internet figured out to get rid o…
Converting from batch to shell
I have a set of batch commands that I’m trying to convert to shell so I can use them on my linux environment. The command should read In windows (using batch), running this command should produce a set of files that are numbered like this: 0001_inside.hdr 0002_inside.hdr etc. However, when I ran this co…
What does `exit()` send `status` to, the parent process or the OS kernel?
In Linux, What does exit() send status to, the parent process or the OS kernel? APUE says that exit() performs certain cleanup processing and then returns to the kernel. But when I run a program in shell, the program returns its exit status to the shell which is its parent process. Answer As you’re prob…
How can I expose a port from ASP.NET Core in Docker linux container in Windows?
I have several ASP.NET Core services defined in docker-compose. I need to be able to expose port in the host network (I use linux containers on Docker for Windows 18.03.0-ce). Sample: Services C1 and C2 are running in containers. Service H3 is running directly in the host, not in container. All services (C1, …
./configure + endless loop
Am trying to build/install LFTP in Centos 7 and can’t get past an endless loop at ./configure stage. Steps I’ve taken: Then I see an endless loop of: Any suggestions/tips appreciated. I’ve tried to use a prefix with ./configure too but that doesn’t help. Answer As discussed in the comm…
In a system call are hardware and software context saved?
Who saves the hardware and software context before the system call routine? Is it the processor itself or the software handler? Thanks. Answer Each system call has a wrapper function as already mentioned, each wrapper function triggers interrupt 128, int 0x80, which automatically saves on kernel stack the reg…