Sponsored Content
Full Discussion: $(< file ) and $( cat file )
Top Forums Shell Programming and Scripting $(< file ) and $( cat file ) Post 303012384 by ctsgnb on Saturday 3rd of February 2018 04:27:16 AM
Old 02-03-2018
Yeah, I agree with you regarding the UUOC one.
The test with -- was just bulk try just to see if it would get the -- as an end of options and see how it would handle the rest of the command line.

I ran it on an AIX machine which didn't return an error message, but a fooled output instead, with some strange control character (the kind of output that sometimes may mess up your PuTTY screen ...)

As Yoda and Scruti noticed, I think the confusing point was that, $(< /dev/urandom tr -dc '[:alnum:],@#:!?+-' | head -c10 )
is not interpreted as the special case $(<filename) but as the $( cmd )

This brings me to the question :
Does the special case $(<filename) support only and strictly 1 file ?

Last edited by ctsgnb; 02-03-2018 at 05:37 AM..
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

cat and lp or pr printing of file

Can you use cat to send the first 25 lines of a file to the printer? I'm thinking I can pipe it with '|' but I'm not school to check printer output. With the 'nl' used, all lines are numbered on the print out, but how does one number only the blank lines? Thanks:) (1 Reply)
Discussion started by: bitwize
1 Replies

2. Shell Programming and Scripting

cat file problem

Hi, I wnat to read a fiel line by line and store each line in a variabel, so I made a for loop: for i in `cat file` ; do #do sth. done; The problem is, that in the file, there are lines with only asterisks like this... (3 Replies)
Discussion started by: bensky
3 Replies

3. UNIX for Dummies Questions & Answers

Easiest way to cat out first 100 lines of a file into a different file?

Not sure how to do this exactly.. just want to take the first 100 lines of a file and cat it out into a second file. I know I can do a more on a file and > it into a different file, but how can I make it so only the first 100 lines get moved over? (1 Reply)
Discussion started by: LordJezo
1 Replies

4. UNIX for Dummies Questions & Answers

How to cat file

I want to cat a file with only show the line contain '/bin/bash' but don't show the line contain 'load' (don't show if the line contain 'load' and '/bin/bash' together), how to type in the command? thk a lot! (2 Replies)
Discussion started by: zp523444
2 Replies

5. Shell Programming and Scripting

Cat all yesterdays file into one file?

I am looking for a command to take files with a specific date and cat them all into big file. I know I can use commands to list all of the files from a certain date. But I want to do that and take those files and make on large files containing all of them. Any help would be great. This is being... (1 Reply)
Discussion started by: Jcheetwood
1 Replies

6. Shell Programming and Scripting

split a line of a file and cat a file with another

Hi, I have two files one.txt laptop boy apple two.txt unix linux OS openS I want to split one.txt into one line each and concatenate it with the two.txt output files onea.txt laptop (4 Replies)
Discussion started by: avatar_007
4 Replies

7. Shell Programming and Scripting

Cat file

how to cat a file by ignoring first line and last line (1 Reply)
Discussion started by: thelakbe
1 Replies

8. UNIX for Advanced & Expert Users

cat can not open file

Hi All, I have stumbled upon very unique issue. In my script I am doing cat file and then greping and cutting so as to assign the value to variable. My file is, <mxc_tl_load_extractdata_prop.bsh> DB_USER=test_oper hostname=xxx FTP_USER=test1_operate MAIL_LIST=xxx@yyy.com... (1 Reply)
Discussion started by: paragd
1 Replies

9. UNIX for Advanced & Expert Users

for i in `cat file` do

in bash: for i in `cat file` ; do echo $i done; how will i do this in perl ? (10 Replies)
Discussion started by: linuxgeek
10 Replies

10. Shell Programming and Scripting

Ssh cat file output into a file on local computer

Hello, I'm on a remote computer by SSH. How can I get the output of "cat file" into a file on the local computer? I cannot use scp, because it's blocked. something like: ssh root@remote_maschine "cat /file" > /locale_machine/file :rolleyes: (2 Replies)
Discussion started by: borsti007
2 Replies
asa(1)							      General Commands Manual							    asa(1)

NAME
asa - Interprets carriage-control characters SYNOPSIS
asa [file...] STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: asa: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPTIONS
None OPERANDS
The pathname of a file to be read. If this parameter is omitted, standard input is read. DESCRIPTION
The asa command writes its input files to standard output, mapping carriage-control characters from the text files to line-printer control sequences. The first character of every input line is removed and, depending on the character removed, an action performed on that character and the rest of the line. If the character removed is: The rest of the line is output without change. A newline character is output, followed by the rest of the input line. A form-feed character is output, followed by the rest of the input line. The newline character of the previ- ous line is replaced with a carriage-return character, which is output, followed by the rest of the input line. If + is the first character in the input, + has the same effect as the space character. [Tru64 UNIX] The character is output, followed by the rest of the input line. EXIT STATUS
The following exit values are returned: Successful completion. An error occurred. EXAMPLES
To view a file (created by a program using FORTRAN-style carriage control characters) on a terminal: asa file To format the FORTRAN output of a.out and direct it to the printer: a.out | asa | lp ENVIRONMENT VARIABLES
The following environment variables affect the execution of asa: Provides a default value for the internationalization variables that are unset or null. If LANG is unset or null, the corresponding value from the default locale is used. If any of the internationalization vari- ables contain an invalid setting, the utility behaves as if none of the variables had been defined. If set to a non-empty string value, overrides the values of all the other internationalization variables. Determines the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multi-byte characters in arguments and input files). Determines the locale for the format and contents of diagnostic messages written to standard error. Determines the location of message catalogues for the processing of LC_MESSAGES. SEE ALSO
Commands: lp(1) Standards: standards(5) asa(1)
All times are GMT -4. The time now is 06:49 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy