Recent questions tagged Unix

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unix - Linux, where are the return codes stored of system daemons and other processes?

How do i know, if a process has completed its execution without any errors? How do i know, if a C++ ... processes (of other users too)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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837 views

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unix - Using grep and sed to replace one string with another

I'd like to replace one string from one file with a string from another file. Though I'm not experienced with ... .3.4 Please update this Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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unix - Get files which are created in last 5 minutes in hadoop using shell script

I have files in HDFS as: drwxrwx--- - root supergroup 0 2016-08-19 06:21 /tmp/logs/root/logs/ ... these files into my local machine. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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unix - How to compare two files in shell script?

Here is my scenario. I have two files which are having records with each record's 3-25 characters is an ... help me out thanks in advance See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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unix - In Linux, why is there a global /dev/stdin file for all processes?

Shouldn't the standard input for different process unique? If so, shouldn't the path of the stdin file be ... anyone have ideas about this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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unix - Transpose using AWK or Perl

Hi I would like to use AWK or Perl to get an output file in the format below. My input file is a space ... to the actual file I am working on See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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778 views

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unix - Single R script on multiple nodes

I would like to utilize CPU cores from multiple nodes to execute a single R script. Each node contains 16 cores ... use of another R package? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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770 views

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unix - What does "<<<" mean on a bash command line? And where is it documented?

What does <<< mean in this command line? bc <<< "1 + 1" It doesn't seem to a combination of < and <<, ... bc Also works in ksh, but not in sh. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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936 views

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unix - Converting timestamp to EPOCH in awk

I am converting timestamps to EPOCH seconds in awk, getting incorrect output for repeated timestamps Input ... 1529012721 1529012721 1529012721 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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769 views

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unix - Why does bash -c "false; echo $?" print 0?

I'm building a script that tries to run some commands on a server (over SSH), and writes on the ... previous command failed in this context? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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912 views

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unix - Bash printf literal verbatim string

To make my code portable, I try to use printf rather than echo. But then printf "-dogs-cats" returns an ... in other Unix flavors as well. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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762 views

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unix - Web Page Screenshots with PHP?

I know there is not a direct way to take a screen shot of a web page with PHP. What would be the ... other methods if anyone knows of anything. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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799 views

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unix - How would you include newline characters in a C-shell echo command?

This sounds ridiculously easy, and it is with other shells. But I can't seem to figure out how to get echo to ... is my file Thanks in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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705 views

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unix - Unable to build a working FIPS capable OpenSSL on HP-UX

I am building openssl-1.0.2f with openssl-fips-2.0.12 (I am going to talk about this configuration in the ... way only: PA-RISC -> IA64. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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766 views

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unix - how to deal with the serial port in android mobile?

actually I know no thing about serial port. but I see an example of sending it an at-command: echo -e ... sometimes replace it with /dev/ttyS0. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.1k views

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unix - How to export a shell variable within a Perl script?

I have a shell script, with a list of shell variables, which is executed before entering a programming environment ... variables are not set. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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816 views

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unix - How to write if else in one line in shell?

I would like to write in one line this: if [$SERVICESTATEID$ -eq 2]; then echo "CRITICAL"; else echo "OK"; fi ... found OK So it doesn't work. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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882 views

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unix - How to compile and run xv6 on windows?

We are being taught xv6 in our course. Currently we use to login to linux server of our school using putty in ... , compile and run) and how? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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863 views

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unix - Delete a column from a delimited file in linux

I have a file in the following format: col1|col2|col3|col4 a|b|c|d e|f||h i|j|k|l I would like to delete col3 ( ... col2|col4 a|b|d e|f|h i|j|l See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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892 views

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unix - _splitpath in Linux

Is there a Linux equivalent of the Win32 API _splitpath function? Details: void _splitpath ( const char *path, ... and extension as output. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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788 views

1 answer

unix - Finding total number of lines in hdfs distributed file using command line

I am working on a cluster where a dataset is kept in hdfs in distributed manner. Here is what I have: [ ... out the total number of lines? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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920 views

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unix - Assigning optarg to an int in C

I am trying to assign an optarg value to an int, but the compiler gives me the following warning: warning: assignment ... ", n); return 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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846 views

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unix - Where is the stack memory allocated from for a Linux process?

We know that when a process is created,one stack is allocated for this process.The size of the stack is ... space or from system space? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.0k views

1 answer

unix - How to capture output of execvp

I'm developing a program which executes a program using execvp. It needs to capture the results of the child ... I'd greatly appreciate it. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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815 views

1 answer

unix - grep -f maximum number of patterns?

I'd like to use grep on a text file with -f to match a long list (10,000) of patterns. Turns out ... line. Thank you everyone for your guidance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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729 views

1 answer

unix - Enter Password in C

I am aware that it is not possible to echo the * while you type in standard ANSI C. But is there a way to ... possible in C? If it is, how? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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748 views

1 answer

unix - Perl: Shebang (space?) "#! "?

I've seen both: #!/path/... #! /path/... What's right? Does it matter? Is there a history? I've heard ... for all I know. Thus I asked it here. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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794 views

1 answer

unix - How add commands to cygwin - npm

I use cygwin on windows 8.1 to have an Unix shell. But I cannot run commands such as npm from it. What ... looks actually more like a npm issue. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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