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In bash, if you enable set -x, the script will echo the evaluated form of all commands to the stderr logs. In tcsh, this same is accomplished with set echo. Is there something similar for R? It would help debugging if I had more verbose output of what the script commands look like as they are being run, without having to manually print or cat every single one.
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Echo is also particularly useful for showing the values of environmental variables, which tell the shell how to behave as a user works at the command line or in scripts. touch is going to be the easiest way to create new files, but it can also be used to change timestamps on files and/or directories.
A bash script can contain any number of normal shell commands: [andrew@pc01 ~ ] $ echo "ls && touch file && ls" > ex.sh A shell script can be executed with the source command or the sh command: [andrew@pc01 ~ ] $ source ex.sh ...
Other common ones include zsh, csh, fish, and more. Play around with different shells and find one that's right for you, but be aware that this tutorial contains bash shell commands only and not everything listed here (maybe none of it) will be applicable to shells other than bash.
Different types of operators exist in Bash to perform various operations using bash script. Some common groups of bash operators are arithmetic operators, comparison operators, bit-wise operators, logical operators, string operators, and file operators. The most used 74 bash operators are explained in this article with examples.
This answer assumes command-line.
The script is:
1 + 1
3 + 3
100 + 100
This it running:
$ Rscript -e 'source("/tmp/run.R", echo=TRUE)'
##
## > 1 + 1
## [1] 2
##
## > 3 + 3
## [1] 6
##
## > 100 + 100
## [1] 200
It shld be trivial to make a wrapper script for that. littler might even have an option like this.
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