How to check if stdin is from the terminal or a pipe in a shell script?
If I get the question right, you may try the following: #!/bin/sh if [ -t 0 ]; then echo running interactivelly else while read -r line ; do echo $line done fi
sh
How to read current app version in Xcode 11 with script
Xcode 11-14 In terminal or bash script in your project you can use: App version xcodebuild -showBuildSettings | grep MARKETING_VERSION | tr -d ‘MARKETING_VERSION =’ // will be displayed 1.1.6 Build version xcodebuild -showBuildSettings | grep CURRENT_PROJECT_VERSION | tr -d ‘CURRENT_PROJECT_VERSION =’ // will be displayed 7 Or (don’t forget to change YouProjectName to your … Read more
Does bash have a way to un-export a variable without unsetting it?
export -n FOO From help export: Options: -f refer to shell functions -n remove the export property from each NAME -p display a list of all exported variables and functions
What is the meaning of set -o pipefail in Bash Script?
man bash says pipefail If set, the return value of a pipeline is the value of the last (rightmost) command to exit with a non-zero status, or zero if all commands in the pipeline exit successfully. This option is disabled by default. Where “pipeline” is command1 | command2 | command3 Without pipefail, the return value … Read more
Bash: evaluate a mathematical term?
echo $(( 3+3 ))
Equivalent of .bat in mac os
May be you can find answer here? Equivalent of double-clickable .sh and .bat on Mac? Usually you can create bash script for Mac OS, where you put similar commands as in batch file. For your case create bash file and put same command, but change back-slashes with regular ones. Your file will look something like: … Read more
Running two commands sequentially in a cron job?
If the first command is required to be completed first, you should separate them with the && operator as you would in the shell. If the first fails, the second will not run.
How can I tell if a file is older than 30 minutes from /bin/sh?
Here’s one way using find. if test “`find file -mmin +30`” The find command must be quoted in case the file in question contains spaces or special characters.
How to get /etc/profile to run automatically in Alpine / Docker
The default shell in Alpine Linux is ash. Ash will only read the /etc/profile and ~/.profile files if it is started as a login shell sh -l. To force Ash to source the /etc/profile or any other script you want upon its invocation as a non login shell, you need to setup an environment variable … Read more
Assigning the output of a command to a variable [duplicate]
You can use a $ sign like: OUTPUT=$(expression)