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) User Commands script(1)
NAME
script - make record of a terminal session
SYNOPSIS
script [-a] [filename]
DESCRIPTION
The script utility makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
record is saved in the file typescript. See WARNINGS.
The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
when the forked shell exits or when Control-d is typed.
OPTIONS
The following option is supported:
-a Appends the session record to filename, rather than overwriting it.
NOTES
script places everything that appears on the screen in filename, including prompts.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|CSI |Enabled |
+-----------------------------+-----------------------------+
SEE ALSO
attributes(5)
WARNINGS
script can pose a security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
privileged user, that is, root. Be sure that typescript is not a link before running script.
SunOS 5.10 30 Jan 2004 script(1)