Is there a way to figure out where in a file a program is reading from? It seems like might be doable with strace or dtrace? To clarify the question and give motivation, say I have a 10GB log file and am counting the number of unique lines: $ cat log.txt | sort | uniq | wc -l Can I
Display duplicate lines in two different files
I have two files and I would like to display the duplicate line. I tried this but it doesn’t work : cat id1.txt | while read id; do grep “$id” id2.txt; done I am wondering if there are any other way to display the duplicate lines in the file. Both of my 2 files contain list of ids. Thank you…
Changing class variable in node declaration in Puppet
I am trying to create a “template” for all my servers. I have 2 configurations. An NTP client (which is taken care of in the baseclass class. I want to create an override specific for the NTP servers by declaring something specific in the node declaration. Something like “baseclass::ntp:rest…
Which threading model is used by node.js? [closed]
It’s difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. Closed 9 years ago. When a new client co…
Missing library while installing ruby-filemagic gem on Linux
I needed gem ruby-filemagic for some requirements in my project. While running bundle install its giving me this error Please help me with this problem. Answer sudo apt-get install libmagic-dev did it for me
How to exclude from `lsof` output the libraries?
I want to print in a log with the help of lsof the information about opened resources but I don’t want the customer to see what libraries are used. I browsed through the lsof man page but I cannot get a hold of how I can exclude only the libraries from the output. Is there an easy method to do
How to extract the MAC address of an interface from witthin a driver code
I’m new to Linux Kernel programming and driver programming. I’m working with madwifi drivers, on Linux with kernel version 2.6.32-37 and wish to extract the MAC address of an interface inside the driver code. I know this information supposed to be found in the netdevice structure fields, but not q…
How to count number of tabs in each line using shell script?
I need to write a script to count the number of tabs in each line of a file and print the output to a text file (e.g., output.txt). How do I do this? Answer
How can I use an at command in a shell script?
I am trying to use the Unix at command (for setting a job to run at a certain time) in a shell script. The time will be specified by user input using getopts and optarg which seem to be working fine, the problem is at. How do I write the at command into the script to run at a certain
Run script on completion of sge job
I am using sun grid engine 6.2u5 version . where requirement is when I submit job on using qsub command on completion job i want to run some script(bash scripts). how can i use -notify option or any other way to track job completion and after completion execute script. Thanks Answer I think hold_jid is what y…