Recent questions tagged shell

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shell - Bash scripting, multiple conditions in while loop

I'm trying to get a simple while loop working in bash that uses two conditions, but after trying many different syntax ... 300 or if $stats = 0. See Question&Answers more detail:os...

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

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shell - Forking / Multi-Threaded Processes | Bash

I would like to make a section of my code more efficient. I'm thinking of making it fork off into multiple ... this the wrong way? 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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shell - How to get "wc -l" to print just the number of lines without file name?

wc -l file.txt outputs number of lines and file name. I need just the number itself (not the file name). I ... But maybe there is a better way? See Question&Answers more detail:os...

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

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shell - how to fix the issue "Command /bin/sh failed with exit code 1" in iphone

I used a cocoa static library in my application. When I compile my library I got the following error: Shell Script ... 1 How can I 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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shell - Print a file's last modified date in Bash

I can't seem to find how to print out the date of a file. I'm so far able to print out all the files ... "$directory"/* do echo "$entry" done See Question&Answers more detail:os...

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

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shell - String comparison in bash. [[: not found

I am trying to compare strings in bash. I already found an answer on how to do it on stackoverflow. In script ... found What am I doing wrong? See Question&Answers more detail:os...

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

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shell - How to exclude this / current / dot folder from find "type d"

find . -type d can be used to find all directories below some start point. But it returns the current directory ( ... . How can it be excluded? See Question&Answers more detail:os...

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

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shell - What does set -e and exec "$@" do for docker entrypoint scripts?

I've noticed that many entrypoint.sh scripts for docker do something like this: #!/bin/bash set -e ... code ... ... -e and the exec "$@" for? See Question&Answers more detail:os...

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

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shell - How to get the second column from command output?

My command's output is something like: 1540 "A B" 6 "C" 119 "D" The first column is always a number, ... 's value (with paired quotes) cleanly? See Question&Answers more detail:os...

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

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shell - Read a variable in bash with a default value

I need to read a value from the terminal in a bash script. I would like to be able to provide a default value ... to do this in a bash script? See Question&Answers more detail:os...

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

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shell - How does bash tab completion work?

I have been spending a lot of time in the shell lately and I'm wondering how the tab autocomplete works. ... the contents of every directory? See Question&Answers more detail:os...

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

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shell - How to ssh to vagrant without actually running "vagrant ssh"?

I would like to reproduce the way Vagrant logs in to my VM within a shell script using an ssh command, so ... regular ssh command to access it? See Question&Answers more detail:os...

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

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shell - How do you echo a 4-digit Unicode character in Bash?

I'd like to add the Unicode skull and crossbones to my shell prompt (specifically the 'SKULL AND CROSSBONES' (U+ ... and choose Unicode (UTF-8). See Question&Answers more detail:os...

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

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shell - How to view files in binary from bash?

I would like to view the contents of a file in the current directory, but in binary from the command line. How can I achieve 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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shell - How to kill all processes matching a name?

Say I want to kill every process containing the word amarok. I can print out the commands I want to execute. But ... kill -9 3089 kill -9 4031 See Question&Answers more detail:os...

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

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shell - How do I copy a folder from remote to local using scp?

How do I copy a folder from remote to local host using scp? I use ssh to log in my server. Then, I ... user/Desktop. How do I achieve 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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shell - is it possible to use variables in remote ssh command?

I'd like to execute several commands in sequence on a remote machine, and some of the later commands ... nice to have everything together. See Question&Answers more detail:os...

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

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shell - Ansible Command module says that '|' is illegal character

I am using Ansible to deploy my project and I trying to check if an specified package is installed, but I have ... illegal this character '|' . See Question&Answers more detail:os...

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

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shell - Concise and portable "join" on the Unix command-line

How can I join multiple lines into one line, with a separator where the new-line characters were, and ... interested to know the options. See Question&Answers more detail:os...

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

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shell - Permission denied at hdfs

I am new to hadoop distributed file system, I have done complete installation of hadoop single node on my ... hduser@ubuntu:/usr/local/hadoop$ See Question&Answers more detail:os...

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

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shell - Rearrange columns using cut

I am having a file in the following format Column1 Column2 str1 1 str2 2 str3 3 I want the columns to be ... why its not working? 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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shell - Bash regex =~ operator

What is the operator =~ called? Is it only used to compare the right side against the left side? Why are ... $phrase =~ $keyword ]] 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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shell - How do you tell if a string contains another string in POSIX sh?

I want to write a Unix shell script that will do various logic if there is a string inside of another string. ... present" else echo "Else" fi See Question&Answers more detail:os...

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

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shell - Retrieve CPU usage and memory usage of a single process on Linux?

I want to get the CPU and memory usage of a single process on Linux - I know the PID. Hopefully, I can ... info from the Linux command-line? See Question&Answers more detail:os...

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

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shell - Replace whole line containing a string using Sed

I have a text file which has a particular line something like sometext sometext sometext TEXT_TO_BE_REPLACED sometext ... this using sed? See Question&Answers more detail:os...

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

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shell - Using wget to recursively fetch a directory with arbitrary files in it

I have a web directory where I store some config files. I'd like to use wget to pull those files down and ... to get this done. Any ideas? See Question&Answers more detail:os...

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

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shell - printf in bash: "09" and "08" are invalid numbers, "07" and "06" are fine

This is my bash script - I just want to left-pad a set of numbers with zeroes: printf "%04d" "09" printf " ... in my sequence seems to be OK. See Question&Answers more detail:os...

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

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shell - What is the maximum size of a Linux environment variable value?

Is there a limit to the amount of data that can be stored in an environment variable on Linux, and if ... 8191 characters Windows 2000/NT 4.0: 2047 characters Question&Answers:os...

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

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