Original Question: “I developed a program on my Mac using Xcode 8’s latest LLVM 8 compiler (clang 8/3.8?) which made heavy use of regular expressions out of c++14. I was then unable to get my code to give me the correct output when running on linux. There seem to be some regular expression compati…
How to replace a word in a file with a word in another file in Linux
I want to change a word in a file, with another word that I get from another file. Let’s say I have 2 files : File #1 contains : jack File #2 contains : Hello name How can I replace the word “name” with “jack”? PS. File #1 contains only this word, no need for any regex. Answer Th…
Using SED to convert sensors command output to a loggable entry
Consider the following sensor command output: I’m trying to turn this into a log entry, like this, where the “temp1” values are placed next to the PCI adapters, and the board (it8721-isa-0290): I think sed is the correct tool for this, but if it’s not please let me know. I have already…
How to grep string and show previous word in a Linux file
i have a file with a lot of IPs and each IP have an ID, like this: Below this Ips and after these Ips the file have more information, its a output to an API call.. I need, grep a IP and then the command shows the id, just the number. Like this: EDIT: More information, the ip will be
Ethernet frames from NIC
I’m searching for help and an opinion-advice for a network project, in which I’m working lately. This requires a Linux machine to be a passive network appliance. Network packets come in from one network interface and come out from another interface ( net–eth0–>Linux PC–eth1…
How to list dependencies of c/c++ static library?
For a static library (.a file), how to list the module-level dependencies of it? I know for a shared library (.so), we can use objdump or readelf to do this: or I can get something like NEEDED libOne.so NEEDED libc.so.6 But for a static library, I can only get the dependencies in symbol-level, for example, by…
vi command to copy certain lines to another file
I have a log file with thousands of lines. I want to copy certain logs ranging between two line numbers to another file so that I can share them within team. For example – I want to copy text from line number 1000 to line 1200 to another file say issueLog.log What is the shortest way to do this? Note:
configure: error: no acceptable C compiler found in $PATH
I am trying to Build and Install the Apache Thrift compiler and libraries I had to type this command is shown in instructions ./configure && make But I get this error: When I type in my command prompt gcc –version I get this gcc (GCC) 5.3.0 Copyright (C) 2015 Free Software Foundation, Inc. This …
Why does tar -c command remove leading `/’ from member names
Looking to find the practical reasons the command tar -c /filea > /fileb gives the following output: tar:Removing_leading / from member names. I have researched it quite a bit but only come across very vague reasons such as protects against some sort of attack etc. The majority just give explanations on a …
Permission Denied when trying to read file w/644 permission
I am trying to write a PHP script for a Web server (lighttpd) to read a file in another user. The Web server runs under user http: The file the script is trying to read has the following permissions: Which I thought meant that any user can read it. The fopen in the script results in a Permission denied: I