Sponsored Content
Full Discussion: $(< file ) and $( cat file )
Top Forums Shell Programming and Scripting $(< file ) and $( cat file ) Post 303012659 by bakunin on Wednesday 7th of February 2018 10:56:12 AM
Old 02-07-2018
Quote:
Originally Posted by jlliagre
Code:
$(< file1 file2)

Using more than one redirection lead to undefined behavior.
Perhaps this is just an aside, but wouldn't redirecting from a named pipe work? That is, if in $(< file1) file1 would be a named pipe being filled by cat file1 file2 ... ?

And second, wouldn't $(< $(cat file1 file2) ) also work? Right now i am travelling with this damn work-laptop and have no U*X-system at hand, so i can only speculate instead of trying....

bakunin
 

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
DIFF(1) 						      General Commands Manual							   DIFF(1)

NAME
diff - print differences between two files SYNOPSIS
diff [-c | -e | -C n] [-br]file1 file2 OPTIONS
-C n Produce output that contains n lines of context -b Ignore white space when comparing -c Produce output that contains three lines of context -e Produce an ed-script to convert file1 into file2 -r Apply diff recursively to files and directories of EXAMPLES
diff file1 file2 # Print differences between 2 files diff -C 0 file1 file2 # Same as above diff -C 3 file1 file2 # Output three lines of context with every diff -c file1 file2 # Same diff /etc /dev # Compares recursively the directories /etc and /dev diff passwd /etc # Compares ./passwd to /etc/passwd DESCRIPTION
the same name, when file1 and file2 are both directories" difference encountered" Diff compares two files and generates a list of lines telling how the two files differ. Lines may not be longer than 128 characters. If the two arguments on the command line are both directories, diff recursively steps through all subdirectories comparing files of the same name. If a file name is found only in one directory, a diagnostic message is written to stdout. A file that is of either block special, character special or FIFO special type, cannot be compared to any other file. On the other hand, if there is one directory and one file given on the command line, diff tries to compare the file with the same name as file in the directory directory. SEE ALSO
cdiff(1), cmp(1), comm(1), patch(1). DIFF(1)
All times are GMT -4. The time now is 05:08 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy