Recent questions tagged Shell

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shell - How can I negate the return-value of a process?

I'm looking for a simple, but cross-platform negate-process that negates the value a process returns. ... unfortunately not shell-independent. 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 - Running java with JAVA_OPTS env variable has no effect

In a shell script, I have set the JAVA_OPTS environment variable (to enable remote debugging and increase ... arguments in the application. 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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shell - How to run a python file using cron jobs

Hi I have created a python file for example as file_example.py The file will output the sensex value Suppose ... ^ SyntaxError: invalid syntax 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 add timestamp to STDERR redirection

In bash/ksh can we add timestamp to STDERR redirection? E.g. myscript.sh 2> error.log I want to get a timestamp written on the log too. See Question&Answers more detail:os...

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

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801 views

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shell - Source files in a bash script

I am using two versions of ROS next to each other. To use one I have to source some environment variables ... # This works now echo $ros_config See Question&Answers more detail:os...

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

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884 views

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shell - How to set child process' environment variable in Makefile

I would like to change this Makefile: SHELL := /bin/bash PATH := node_modules/.bin:$(PATH) boot: @supervisor ... NODE_ENV. What did I miss? 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 - Access mysql remote database from command line

I have a server with Rackspace. I want to access the database from my local machine command line. I tried ... connect to the remote database? See Question&Answers more detail:os...

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

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715 views

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shell - What is the most elegant way to remove a path from the $PATH variable in Bash?

Or more generally, how do I remove an item from a colon-separated list in a Bash environment variable? I ... $PATH elements in shell scripts? See Question&Answers more detail:os...

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

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862 views

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shell - How to check if a file contains a specific string using Bash

I want to check if a file contains a specific string or not in bash. I used this script, but it doesn't work: ... fi What's wrong in my code? See Question&Answers more detail:os...

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

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846 views

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shell - Howto split a string on a multi-character delimiter in bash?

Why doesn't work the following bash code? for i in $( echo "emmbbmmaaddsb" | split -t "mm" ) do echo "$i" done expected output: e bb aaddsb See Question&Answers more detail:os...

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

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687 views

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shell - Should I use a Shebang with Bash scripts?

I am using Bash $ echo $SHELL /bin/bash and starting about a year ago I stopped using Shebangs with my ... shell script, ASCII text executable See Question&Answers more detail: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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shell - java Runtime.getRunTime().exec & wildcards?

i'm trying to remove junk files by using Process p = Runtime.getRuntime().exec(); it works fine as long ... things as outlined here, right? See Question&Answers more detail:os...

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

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740 views

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shell - unix command line execute with . (dot) vs. without

At a unix command line, what's the difference between executing a program by simply typing it's name, vs. executing a ... .g.: runme vs. . runme See Question&Answers more detail:os...

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

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1.1k views

1 answer

shell - How to source a script in a Makefile?

Is there a better way to source a script, which sets env vars, from within a makefile? FLAG ?= 0 ifeq ($(FLAG) ... $@' else ...targets... endif See Question&Answers more detail:os...

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

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