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Top Forums Shell Programming and Scripting How to remove newline character if it is the only character in the entire file.? Post 303029494 by Don Cragun on Sunday 27th of January 2019 07:17:09 PM
Old 01-27-2019
Even if your system doesn't have the stat command, you could also use:
Code:
[ $(wc -c < "$file") -eq 1 ] && > "$file"

The command:
Code:
wc -c < "$file"

prints the number of bytes found on its standard input (in this case the contents of the file you're interested in) and if that is equal to 1, the redirection recreates the file as an empty file.
 

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SHTOOL-MDATE.TMP(1)					      GNU Portable Shell Tool					       SHTOOL-MDATE.TMP(1)

NAME
shtool-mdate - GNU shtool pretty-print last modification time SYNOPSIS
shtool mdate [-n|--newline] [-z|--zero] [-s|--shorten] [-d|--digits] [-f|--field-sep str] [-o|--order spec] path DESCRIPTION
This command pretty-prints the last modification time of a given file or directory path, while still allowing one to specify the format of the date to display. OPTIONS
The following command line options are available. -n, --newline By default, output is written to stdout followed by a "newline" (ASCII character 0x0a). If option -n is used, this newline character is omitted. -z, --zero Pads numeric day and numeric month with a leading zero. Default is to have variable width. -s, --shorten Shortens the name of the month to a english three character abbreviation. Default is full english name. This option is silently ignored when combined with -d. -d, --digits Use digits for month. Default is to use a english name. -f, --field-sep str Field separator string between the day month year tripple. Default is a single space character. -o, --order spec Specifies order of the day month year elements within the tripple. Each element represented as a single character out of ``"d"'', ``"m"'' and ``"y"''. The default for spec is ``"dmy"''. EXAMPLE
# shell script shtool mdate -n / shtool mdate -f '/' -z -d -o ymd foo.txt shtool mdate -f '-' -s foo.txt HISTORY
The GNU shtool mdate command was originally written by Ulrich Drepper in 1995 and revised by Ralf S. Engelschall <rse@engelschall.com> in 1998 for inclusion into GNU shtool. SEE ALSO
shtool(1), date(1), ls(1). 18-Jul-2008 shtool 2.0.8 SHTOOL-MDATE.TMP(1)
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