Recent questions tagged UNIX

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unix - What do double-asterisk wildcards mean?

I've tried the following command but I am having trouble interpreting it: ls ** but I'm not sure exactly what ... and why that is the result. 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 - In Linux, how to tell how much memory processes are using?

I think I may have a memory leak in my LAMP application (memory gets used up, swap starts getting used, etc. ... see this information in *nix? 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 - List files recursively in Linux CLI with path relative to the current directory

This is similar to this question, but I want to include the path relative to the current directory in ... using standard Unix commands? 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 - Why always ./configure; make; make install; as 3 separate steps?

Every time you compile something from source, you go through the same 3 steps: $ ./configure $ make $ make ... people do the 3 steps separately? 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 - Need to link cmake project to dl library

I am building a shared library that uses the dlopen and dlsym system calls. When I build, I get the error undefined ... can I fix this? 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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908 views

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unix - How to attach a process in gdb

I have a simple C program that forks a process and then runs an executable. I want to attach the child process ... or directory. Any idea why? See Question&Answers more detail:os...

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

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871 views

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unix - Using grep for multiple search patterns

Consider I have the following stream of data: BODY1 attrib1: someval11 attrib2: someval12 attrib3: someval13 ... single pattern specified. See Question&Answers more detail:os...

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

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921 views

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unix - Compare a string using sh shell

I am using SH shell and I am trying to compare a string with a variable's value but the if condition is always ... with a NULL or empty string? See Question&Answers more detail:os...

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

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937 views

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unix - Equivalent of *Nix 'which' command in PowerShell?

How do I ask PowerShell where something is? For instance, "which notepad" and it returns the directory where ... according to the current paths. 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 - Shell one liner to prepend to a file

This is probably a complex solution. I am looking for a simple operator like ">>", but for prepending. I ... tmp cat myheader tmp > myfile Anything smarter? Question&Answers:os...

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

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1.2k views

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unix - Generate sha256 with OpenSSL and C++

I'm looking to create a hash with sha256 using openssl and C++. I know there's a similar post at Generate SHA ... I/opt/ssl/include/ -L/opt/ssl/lib/ -lcrypto Question&Answers:os...

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

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unix - How/When does Execute Shell mark a build as failure in Jenkins?

The horror stories I found while searching for an answer for this one... OK, I have a .sh script which ... does Execute Shell mark my build as a failure? Question&Answers:os...

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

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777 views

1 answer

unix - Executing JavaScript without a browser?

I am looking into Javascript programming without a browser. I want to run scripts from the Linux or ... viable scripting language for processing large data. Question&Answers:os...

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

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1.0k views

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unix - How does grep run so fast?

I am really amazed by the functionality of GREP in shell, earlier I used to use substring method in java but now I ... on the web. Can anyone help me with this? Question&Answers:os...

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

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809 views

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unix - Why an ELF executable could have 4 LOAD segments?

There is a remote 64-bit *nix server that can compile a user-provided code (which should be written in ... certain exploits, but why have two such segments? Question&Answers:os...

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

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1.3k views

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unix - How to remove carriage return from a variable in shell script

I am new to shell script. I am sourcing a file, which is created in Windows and has carriage returns, using the ... How can I remove the ' ' from the variable? Question&Answers:os...

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

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801 views

1 answer

unix - How to set environment variable for everyone under my linux system?

Can I have certain settings that are universal for all my users? Question&Answers:os...

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

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828 views

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unix - What's the difference between nohup and a daemon?

What are the implications of running a script as a daemon versus using nohup? I know what the difference is in ... but what impact does that have on my script? Question&Answers:os...

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

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1.3k views

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unix - Replace comma with newline in sed on MacOS?

I have a file of strings that are comma separated. I'm trying to replace the commas with a new line. I've tried ... but it is not working. What am I missing? Question&Answers:os...

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

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927 views

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unix - Delete specific line number(s) from a text file using sed?

I want to delete one or more specific line numbers from a file. How would I do this using sed? Question&Answers:os...

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

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950 views

1 answer

unix - Use grep --exclude/--include syntax to not grep through certain files

I'm looking for the string foo= in text files in a directory tree. It's on a common Linux machine, I ... with common tools (like grep or the suggested find). Question&Answers:os...

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

0 votes

950 views

1 answer

unix - Grep for literal strings

I'm after a grep-type tool to search for purely literal strings. I'm looking for the occurrence of a ... but just search for literal occurrences of a string? Question&Answers:os...

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

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770 views

1 answer

unix - How to provide password to a command that prompts for one in bash?

I'm writing a UNIX shell function that is going to execute a command that will prompt the user for a password. ... of piping a password into a command in bash. Question&Answers:os...

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

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758 views

1 answer

unix - Is there any simple way to benchmark Python script?

Usually I use shell command time. My purpose is to test if data is small, medium, large or very large set, how ... tools for Linux or just Python to do this? Question&Answers:os...

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

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938 views

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unix - How to pretty print XML from the command line?

Related: How can I pretty-print JSON in (unix) shell script? Is there a (unix) shell script to format XML in human- ... </foo> <bar value="ipsum" /> </root> Question&Answers:os...

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

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885 views

1 answer

unix - What is the difference between a symbolic link and a hard link?

Recently I was asked this during a job interview. I was honest and said I knew how a symbolic link behaves and ... link and how it differs from a symbolic one. Question&Answers:os...

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

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976 views

1 answer

unix - How can I pretty-print JSON in a shell script?

Is there a (Unix) shell script to format JSON in human-readable form? Basically, I want it to transform the following: { " ... "foo": "lorem", "bar": "ipsum" } Question&Answers:os...

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

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833 views

1 answer

unix - How to read a file into a variable in shell?

I want to read a file and save it in variable, but I need to keep the variable and not just print out the file. ... a variable! Is there an easy way to do this? Question&Answers:os...

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

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