Recent questions tagged unix

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unix - ProcessBuilder environment variable in java

I'm trying to add a environment variable for a ProcessBuilder object but then when I call on that new variable ... use it in the ProcessBuilder. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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600 views

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unix - How to determine a terminal's background color?

I'd like to know if there is any way to determine a terminal's background color ? In my case, using ... something else than a plain color. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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585 views

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unix - How to get pid given the process name

Hi I have searched various forums and here as well, I could find some answers for Linux and Mac but not ... string) Any suggestion would help. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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unix - Random access to gzipped files?

I have a very large file compressed with gzip sitting on disk. The production environment is "Cloud"-based, so ... the I/O throughput overhead? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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unix - How to overwrite some bytes of a binary file with dd?

I have a binary file and i want to replace the value A2 at address DEADBEEF with some other value, say A1. ... work with most basic Unix tools. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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693 views

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unix - Use shebang/hashbang in Windows Command Prompt

I'm currently using the serve script to serve up directories with Node.js on Windows 7. It works well in the ... executing within sh -c? Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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888 views

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unix - Remove line breaks in a FASTA file

I have a fasta file where the sequences are broken up with newlines. I'd like to remove the newlines. Here's ... in the correct format? Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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unix - Use tee (or equivalent) but limit max file size or rotate to new file

I would like to capture output from a UNIX process but limit max file size and/or rotate to a new file. ... and start a new log/my_program_log. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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unix - Truncating a file while it's being used (Linux)

I have a process that's writing a lot of data to stdout, which I'm redirecting to a log file. I'd like ... group 1292311 Jun 11 2009 sample.log See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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874 views

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unix - Should a directory path variable end with a trailing slash?

When defining a path to a directory as a variable or constant, should it end with a trailing slash? What is ... slash, which left me unsure. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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592 views

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unix - Whats the difference between running a shell script as ./script.sh and sh script.sh

I have a script that looks like this #!/bin/bash function something() { echo "hello world!!" } something | tee ... ways in which I can fix this. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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646 views

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unix - Performing grep operation in tar files without extracting

I have list of files which contain particular patterns, but those files have been tarred. Now I want to search for ... the files. Any idea...? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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557 views

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unix - Pipe output from shell command to a python script

I want to run a mysql command and set the output of that to be a variable in my python script. Here is ... script and have it print the output? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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748 views

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unix - How to get second last field from a cut command

I have a set of data as input and need the second last field based on deleimiter. The lines may have ... ,text,line expected output blaah text See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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841 views

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unix - What is the difference between SIGSTOP and SIGTSTP?

Just wondering about the difference between SIGSTOP and SIGTSTP signals. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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675 views

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unix - Get the date (a day before current time) in Bash

How can I print the date which is a day before current time in Bash? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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737 views

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unix - count (non-blank) lines-of-code in bash

In Bash, how do I count the number of non-blank lines of code in a project? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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690 views

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unix - awk compare columns from two files, impute values of another column

I want to compare the second columns from two files. If there is a match, print the corresponding value of the ... $1]}' File2 File1 Thank you See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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583 views

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unix - process re-parenting: controlling who is the new parent

Is the new parent always "init" or is there some way to control who gets to be the new parent? Wikipedia ... "init" as their parent process. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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667 views

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unix - Escaping colons in filenames in a Makefile

Is there a way to get GNU make to work correctly with filenames that contain colons? The specific problem I'm ... contains no `%'. Stop. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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684 views

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unix - split file on Nth occurrence of delimiter

Is there a one-liner to split a text file into pieces / chunks after every Nth occurrence of a delimiter? example: the ... 't seem to do this... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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729 views

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unix - Windows Equivalent of 'nice'

Is there a Windows equivalent of the Unix command, nice? I'm specifically looking for something I can use at ... come up with better adjectives. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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557 views

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unix - Signal Handling in C

How can I implement signal Handling for Ctrl-C and Ctrl-D in C....So If Ctrl-C is pressed then the program will ... %s ",msg); } } Thanks, Dave See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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585 views

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unix - Redirecting FORTRAN (called via F2PY) output in Python

I'm trying to figure out how to redirect output from some FORTRAN code for which I've generated a Python ... to use ttysnoop). Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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848 views

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unix - What's the difference between --general-numeric-sort and --numeric-sort options in gnu sort

sort provides two kinds of numeric sort. This is from the man page: -g, --general-numeric-sort compare ... value What's the difference? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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944 views

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unix - Differences between System V and Posix semaphores

What are the trade-offs between using a System V and a Posix semaphore? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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524 views

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unix - How do I determine if a web page exists with shell scripting?

I am trying to make a program that can convert a series of manga scans into one pdf file, and I don't want ... just check if a web page exists? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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565 views

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unix - Is mongodb running?

I have installed mongodb and the php drivers on my unix server. My question is how can I tell if ... anon):1154 exception: connect failed See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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