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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 303029489 by nezabudka on Sunday 27th of January 2019 02:59:04 PM
Old 01-27-2019
Check if the file contains printable characters
grep -q "[[:print:]]" $file;
if not if ! truncated to zero >$file
I apologize for the not quite detailed answer, I just learn English
 

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readproctitle(8)					      System Manager's Manual						  readproctitle(8)

NAME
readproctitle - maintains an automatically rotated log in memory for inspection by ps(1). readproctitle is available in daemontools 0.75 and above. SYNOPSIS
readproctitle L D DESCRIPTION
L consists of any number of arguments. D is one argument consisting of at least five dots. readproctitle reads data into the end of D, shifting D to the left to make room. This means that the most recent data is visible to process-listing tools such as ps(1). readproctitle always leaves three dots at the left of D. For example, if readproctitle io errors: .................... reads the data fatal error xyz warning abc then its command-line arguments change to readproctitle io errors: ... xyz!warning abc! with a newline character in place of each !. Process-listing tools typically show the newline character as ? or . readproctitle exits when it reaches the end of input. Beware that most implementations of ps(1) have small argument-length limits. These limits apply to the total length of readproctitle L D. I have not seen a system with a limit below 512 bytes. SEE ALSO
supervise(8), svc(8), svok(8), svstat(8), svscanboot(8), svscan(8), fghack(8), pgrphack(8), multilog(8), tai64n(8), tai64nlocal(8), setu- idgid(8), envuidgid(8), envdir(8), softlimit(8), setlock(8), ps(1) http://cr.yp.to/daemontools.html http://cr.yp.to/slashcommand.html readproctitle(8)
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