01-03-2020
Yes, the value of
outvar will just hold all the content of your file. You might prefer to process the variable or create another by reading the file in a different way. It's up to you, but you can use many ways to read specific things. For example:-
- To read the 3rd line, this would do sed -n3p This could be written as third_line="$(printf "%s" "${outvar}" | sed -n3p)" or third_line="$(sed -n3p filename)" depending
- To set a value if your file is null, you could [ ! -s filename ] && variable=0
- To set a value if your variable is null, you could [ -z "${outvar}" ] && outvar=0
- To scan for non-numerics and set the value to zero, you could attack it in several ways, e.g. delete the digits from the string and see if there's anything left; try to add zero and check the return code (writing all output/error messages to /dev/null to keep it clean) etc. etc. It depends what makes sense to you.
Does this help you sanity check your data?
Robin
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SCRIPT(1) BSD General Commands Manual SCRIPT(1)
NAME
script -- make typescript of terminal session
SYNOPSIS
script [-akq] [-t time] [file [command ...]]
DESCRIPTION
The script utility makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an
interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1).
If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript.
If the argument command is given, script will run the specified command with an optional argument vector instead of an interactive shell.
The following options are available:
-a Append the output to file or typescript, retaining the prior contents.
-k Log keys sent to program as well as output.
-q Run in quiet mode, omit the start and stop status messages.
-t time
Specify time interval between flushing script output file. A value of 0 causes script to flush for every character I/O event. The
default interval is 30 seconds.
The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-D (if
ignoreeof is not set) for the C-shell, csh(1)).
Certain interactive commands, such as vi(1), create garbage in the typescript file. The script utility works best with commands that do not
manipulate the screen. The results are meant to emulate a hardcopy terminal, not an addressable one.
ENVIRONMENT
The following environment variable is utilized by script:
SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most
shells set this variable automatically).
SEE ALSO
csh(1) (for the history mechanism).
HISTORY
The script command appeared in 3.0BSD.
BUGS
The script utility places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects.
It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues.
When running in -k mode, echo cancelling is far from ideal. The slave terminal mode is checked for ECHO mode to check when to avoid manual
echo logging. This does not work when in a raw mode where the program being run is doing manual echo.
BSD
January 22, 2004 BSD