I have a problem with an if/else statement in bash.
I want to check if the file exists before running a task (for example here, counting lines), and if not I need to create an empty output file
Code:
if [ -f /input.tab ]
then
wc -l input.tab > output.temp
else
>output.temp
fi
The problem is even if the condition is true (the file actually exists) it goes directly to the else part and create an empty file in any case.
Could someone explain me what is wrong with my syntax... !!!
Does the file input.tab really exist in the root directory (/input.tab), or is it in the current directory (input.tab)? It would seem that you should use the same pathname in both the test and the wc commands.
This User Gave Thanks to Don Cragun For This Post:
Hello,
I wonder whether if we have a open file dialog as (in gtk+) in html. I know that a submit-type form (such as <input value="Add File" type="submit">) opens such dialog, but it -naturally- tries to submit the file chosen. I only want to find out the file name, not upload it.
Thanks! (0 Replies)
I'd like a bash script to simply check to see if any file/files are present in a source directory, and if so move it/them to a target directory.
I have this but it doesn't work:
#!/bin/bash
if
then
mv /source/* /target
fi
What is the right syntax? Thanks! (4 Replies)
Hello
I have srv RHEL5, file system UTDM (EMC DiskXtender Unix/Linux File System Manager 3.5 & EMC Centera).
it all works under the scheme: have disk is formatted with a file system UTDM, drive open network - NFS, it write data, then migrate the data in the repository - EMC Centera.
There are... (0 Replies)
basically im trying to make this work in a bash shell script without using if statements
if
then
echo testfile exists!
fi
what it does is check if the file exists or not
i have this line but its not working, it checks if the testfile exists if it doesnt it 2> to the dev null... (3 Replies)
hello. this is the code
#!/bin/sh
total1024=0
total2048=0
total8192=0
if ; then
if ; then
while read variable
do
if ; then
total1024=$(( $total1024 + 1 ))
fi
if ; then
total2048=$((... (4 Replies)
Hey all,
Here's my dilemma:
1. I'm a newbie at scripting!
2. I need to create a script that checks: If a file size is equal to zero, then stop the installation.
Is there a way to do this or am I wasting my time???
Thanx in advance! :b: (2 Replies)
Hi
#Testing for file existence
if ; then
echo 'SCHOOL data is available for processing'
else
echo 'SCHOOL DATA IS NOT AVAILABLE FOR PROCESSING'
:
i wrote a script, where it begins by checking if file exists or not.
If it exists, it truncates the database... (2 Replies)
Hi!
I wanted to simplify my bash prompt, so I edited my etc/bashrc file. I thought this was the file that would override any other env files. When I opened it, I saw that the way it was setup was not what my prompt looked like, although I forget exactly what was there. But i edited it the way I... (1 Reply)
Hi All,
I am facing a problem while checking for existence of file over ssh !
Basically, i want to ssh and check if file exists.. If file exists return 1. If file does not exits return 0 (or any value)
I am using the below code
file_avail=`ssh username@host "if ]; then exit 1;... (10 Replies)
OK So I Recently Bought A whatbox Seed-box Act!!:cool:
I am connected to whatbox via SSH!!!
Now i have downloaded a movie and renamed it to 2yify.mp4 (800MB):o
When I TYPE the command to split it which is:)
split -b 400m 2yify.mp4
It gets renamed into two parts with different names... (4 Replies)
Discussion started by: anime12345
4 Replies
LEARN ABOUT FREEBSD
paste
PASTE(1) BSD General Commands Manual PASTE(1)NAME
paste -- merge corresponding or subsequent lines of files
SYNOPSIS
paste [-s] [-d list] file ...
DESCRIPTION
The paste utility concatenates the corresponding lines of the given input files, replacing all but the last file's newline characters with a
single tab character, and writes the resulting lines to standard output. If end-of-file is reached on an input file while other input files
still contain data, the file is treated as if it were an endless source of empty lines.
The options are as follows:
-d list Use one or more of the provided characters to replace the newline characters instead of the default tab. The characters in list
are used circularly, i.e., when list is exhausted the first character from list is reused. This continues until a line from the
last input file (in default operation) or the last line in each file (using the -s option) is displayed, at which time paste
begins selecting characters from the beginning of list again.
The following special characters can also be used in list:
newline character
tab character
\ backslash character
Empty string (not a null character).
Any other character preceded by a backslash is equivalent to the character itself.
-s Concatenate all of the lines of each separate input file in command line order. The newline character of every line except the
last line in each input file is replaced with the tab character, unless otherwise specified by the -d option.
If '-' is specified for one or more of the input files, the standard input is used; standard input is read one line at a time, circularly,
for each instance of '-'.
EXIT STATUS
The paste utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
List the files in the current directory in three columns:
ls | paste - - -
Combine pairs of lines from a file into single lines:
paste -s -d '
' myfile
Number the lines in a file, similar to nl(1):
sed = myfile | paste -s -d '
' - -
Create a colon-separated list of directories named bin, suitable for use in the PATH environment variable:
find / -name bin -type d | paste -s -d : -
SEE ALSO cut(1), lam(1)STANDARDS
The paste utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.
HISTORY
A paste command appeared in Version 32V AT&T UNIX.
BSD June 25, 2004 BSD