Recent questions tagged bash

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bash - How does "set -e" work with subshells?

I was wondering whether set -e propagates through subshells (i.e. does a subshell inherit the -e setting of ... not. Can someone explain 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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1.4k views

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bash - Can envsubst not do in-place substitution?

I have a config file which contains some ENV_VARIABLE styled variables. This is my file. It might contain $EXAMPLES of ... 'd like to use that. See Question&Answers more detail:os...

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

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883 views

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bash - Output for loop to a file

I am trying to have a for loop output a text to a file 10 times. Here is what I have: for ((i=1;i ... prints Hello World to the screen 10 times. See Question&Answers more detail:os...

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

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848 views

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bash - Stop git from writing non-errors to stderr

I have a script that I am using to automatically sync various remote git repositories. One thing I am ... while preserving genuine errors. See Question&Answers more detail:os...

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

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864 views

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bash - How do I use the linux flock command to prevent another root process from deleting a file?

I would like to prevent one of my root processes from deleting a certain file. So I came across the flock ... from deleting a file in linux? See Question&Answers more detail:os...

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

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945 views

1 answer

bash - How does "set -e" work with subshells?

I was wondering whether set -e propagates through subshells (i.e. does a subshell inherit the -e setting of ... not. Can someone explain this? See Question&Answers more detail:os...

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

0 votes

1.3k views

1 answer

bash - Can envsubst not do in-place substitution?

I have a config file which contains some ENV_VARIABLE styled variables. This is my file. It might contain $EXAMPLES of ... 'd like to use that. 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

1 answer

bash - How do i get last sunday date from a given date in unix

get last sunday date as output from a given date (not current date) as input Example input: 08-30-2017 (%m-%d-%Y) ... +%m-%d-%Y -d "last Sun" See Question&Answers more detail:os...

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

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874 views

1 answer

bash - Why didn't back quotes in a shell script help me cd to a directory

I have a shell script with the following code: dir=sample `mkdir $dir` `cp /home/bhavya/workspace/UnetStack/logs/ ... work with the back quote? See Question&Answers more detail:os...

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

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927 views

1 answer

bash - How to open a command line window in Node.js?

How to open a new command line window and execute a bash command which runs in a separate independent process? I ... to OS X and Linux. See Question&Answers more detail:os...

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

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939 views

1 answer

bash - Write to terminal after redirecting stdout to a file without using stderr?

I have two shell scripts, one that serves as the main "program" and another that serves as a "library." In ... always show up on the terminal. 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

1 answer

bash - Print unicode character

With Bash, you can use printf with hex codes xHH byte with hexadecimal value HH (1 to 2 digits) uHHHH ... $BASH_VERSION 4.1.10(4)-release See Question&Answers more detail:os...

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

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861 views

1 answer

bash - Replace multiple patterns, but not with the same string

is it possible to change multiply patterns to different values at the same command? lets say I have A B C D ... than that... thank you! See Question&Answers more detail:os...

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

0 votes

1.1k views

1 answer

bash - Git hook, modify commit files

I'm trying to write git pre-commit hook script, it should write date of commit at the begining of ... git commit --amend #recursive exit See Question&Answers more detail:os...

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

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934 views

1 answer

bash - Format output in columns

I was wondering how to format the following output: -0.3116274D-04 -0.2389361D-04 -0.1192458D-04 0.3306203D-04 0. ... //g' File | column -n See Question&Answers more detail:os...

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

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979 views

1 answer

bash - Redirect only the last line of STDOUT to a file

I'm compiling Scala code and write the output console output in file. I only want to save the last line of ... command I can achieve my goal? 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

1 answer

bash - echo to stderr and tee to log file?

In bash script, echo "error" 1>&2 | tee -a log will print stderr in screen but no log to file, how to do these at same time? 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

bash - Limit the number of running jobs in SLURM

I am queuing multiple jobs in SLURM. Can I limit the number of parallel running jobs in slurm? 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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1.2k views

1 answer

bash - tail -f into grep into cut not working properly

i'm trying to build a shell script to monitor some log files. I'm using a command like this: tail -f /var/ ... me to solve this? Thank you :) See Question&Answers more detail:os...

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

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922 views

1 answer

bash - Change string char at index X

I'm searched for a long time how to do a simple string manipulation in UNIX I have this string: theStr='........ ... = 'A'; // Zero based index. See Question&Answers more detail:os...

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

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987 views

1 answer

bash - A better way to execute multiple MySQL commands using shell script

I would like to write a *.sh script to execute multiple MySQL commands. Currently, what I can do is something ... to execute a MySQL command? See Question&Answers more detail:os...

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

0 votes

1.1k views

1 answer

bash - Using a variable in brace expansion range fed to a for loop

Here is myscript.sh #!/bin/bash for i in {1..$1}; do echo $1 $i; done If I run myscript.sh 3 the output ... written for i in {1..3} directly? See Question&Answers more detail:os...

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

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702 views

1 answer

bash - Executing Shell Scripts from Java, Shell scripts having read operation

I have a Shell Scripts that read the Input #!/bin/bash echo "Type the year that you want to check (4 ... .out.println("Program terminated!"); See Question&Answers more detail:os...

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

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968 views

1 answer

bash - How to automate password entry?

I want to install a software library (SWIG) on a list of computers (Jenkins nodes). I'm using the following ... that don't involve SSH keys. See Question&Answers more detail:os...

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

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1.3k views

1 answer

bash - Shell script not running via crontab, but runs fine manually

I have a script that checks if pptp vpn is running , and if not it reconnect the pptp vpn , when i run the ... then /usr/sbin/pppd call home fi See Question&Answers more detail:os...

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

0 votes

1.3k views

1 answer

bash - Redirect STDOUT and STDERR to socket in C?

I am trying to redirect STDOUT AND STDERR to a socket. I did: if(fork() == 0) { dup2(newsock, STDOUT_FILENO); ... ); dup(newsock); Thanks a lot. See Question&Answers more detail:os...

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

0 votes

1.1k views

1 answer

bash - shuffle a file that is too large to fit in memory

I've got a file that's too large to fit in memory. shuf seems to run in RAM, and sort -R doesn' ... options other than rolling my own solution? See Question&Answers more detail:os...

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

0 votes

1.3k views

1 answer

bash - Shuffling lines of a file with a fixed seed?

I want to shuffle the lines of a file with a fixed seed so that I always get the same random order. The ... it sorts with a fixed random seed? See Question&Answers more detail:os...

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

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