Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Bash - Trying to cat a file that is a variable
Top Forums Shell Programming and Scripting Bash - Trying to cat a file that is a variable Post 302987677 by paperbackwriter on Wednesday 14th of December 2016 08:57:22 AM
Old 12-14-2016
Bash - Trying to cat a file that is a variable
Thank you in advance for looking at this, I've scoured the internet and can't find the answer I'm looking for!! - I am new at bash script so please bare with me!!

I have a script where I've identified individual files within a folder, the filename is then stored as a variable ($filename):
Code:
filename = ls -l | grep .csv | awk -v var="$filenum" '{if (NR==$filenum) print $0}' | awk -F " "  '{print $9}'

$filenum is used to tell the script how many files there are and will be used in a while loop to work on all the files in the folder.

I then want to able to cat $filename and display the files contents, rather than the variable. And all I keep getting is the variable - Please help!!!

Thanks again.

---------- Post updated at 08:57 AM ---------- Previous update was at 07:42 AM ----------

Thanks to those that have viewed this, I have now resolved it by using for f in ......
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

variable= 'cat file|wc -l' String problems

Hi, does anybody knows about wc -l, how to transform it inot a just number? this script ALWAYS executes the command3!!, However, the value of BMU_RUNNING is 1 case $BMU_RUNNING in *0) command1 ;; *1) command 2;; *)command 3;; esac The... (3 Replies)
Discussion started by: Santiago
3 Replies

2. Shell Programming and Scripting

need help with my implementation of cat in bash

Hello, A few days ago I created my amateur version of the cat function in bash. Here is what I've done: #!/bin/bash #This is mycat. Similar to cat. #For detailed information use path/to/mycat.sh -h option arguments=$# if ] #in case of standard input then while ] do read input... (4 Replies)
Discussion started by: sanchopansa
4 Replies

3. UNIX for Dummies Questions & Answers

Using a variable inside a file to cat another.

I have a question to do and it's somewhat confusing. It says, and I quote "Create a file called file_1 with three lines of text in it. Create a shell variable called "f_name", assign it the string "file_1". Use the cat command and the variable "f_name" to display the contents of the file... (3 Replies)
Discussion started by: MaestroRage
3 Replies

4. Shell Programming and Scripting

redirect cat to variable

hello just i saw a really strange for cat i have file (file1) contains line /home/rajiv/proj1/*.txt now applied a commonds DDPATH="$(cat file1)" echo $DDPATH it shows all the txt files in that folder like /home/rajiv/proj1/read1.txt /home/rajiv/proj1/read2.txt... (7 Replies)
Discussion started by: shailesh_arya
7 Replies

5. Shell Programming and Scripting

cat vs head vs readline get variable from txt file

I have a file with a single filename in it, which I want to assign to a BASH variable, so I've been trying: c=$(head -1 somefile) echo $c which outputs correctly, but them when I do ... somecommand $c it says it can't find the file, is that because it's grabbing the whole line, and... (5 Replies)
Discussion started by: unclecameron
5 Replies

6. Shell Programming and Scripting

cat > variable + format

I wanted to store a value read from a file in a variable with a given format. I was doing the first step as follows : it0="$(cat ./myfile)" I thought the second step would work as: it0= ` printf "%6.3f\n" $it0 ` but it says "./curplot.sh: line 33: 0.035: command not found", although it... (2 Replies)
Discussion started by: josegr
2 Replies

7. Shell Programming and Scripting

cat file with variable substitution

MyFile contains: ALTER TABLE $DBN.$TBN ADD $COL $TYP COMPRESS ($VAL); I need to cat the file and have it substitute all of the variables with their contents. cat MyFile does not work. The following works for the first line, but errors on the second line because of the paren: $ while read... (2 Replies)
Discussion started by: Phil27577
2 Replies

8. Shell Programming and Scripting

How to store remote variable from remote cat file ??

I am trying to cat on a file located on remote server and assign it to remote variable. I have both local and remote variables. Running below script from local. test.sh J_NAME=XXX2 J_IP=XXX ssh $J_IP "ps auxw |grep java | grep -v grep |grep $J_NAME | awk '{print ... (2 Replies)
Discussion started by: oraclermanpt
2 Replies

9. Shell Programming and Scripting

Find matching file in bash with variable file names but consisent prefixs

As part of a bash the below line strips off a numerical prefix from directory 1 to search for in directory 2. for file in /home/cmccabe/Desktop/comparison/missing/*.txt do file1=${file##*/} # Strip off directory getprefix=${file1%%_*.txt} ... (5 Replies)
Discussion started by: cmccabe
5 Replies

10. UNIX for Beginners Questions & Answers

Bash: Insert in a variable a file

hi all i have a problem in the bash shell. i'd like insert in a variable a file for example : i have a file datafine.log in this file there is : 17/JUN/2019 i want to insert the value of datafine.log in a variable. Regards Frncesco edit by bakunin: please use CODE-tags for your data... (2 Replies)
Discussion started by: Francesco_IT
2 Replies

LEARN ABOUT DEBIAN

gmt_shell_functions

GMT_SHELL_FUNCTIONS.SH(1gmt)				       Generic Mapping Tools				      GMT_SHELL_FUNCTIONS.SH(1gmt)

NAME

       gmt_shell_functions.sh - Practical functions to be used in GMT bourne shell scripts

SYNOPSIS

       gmt_init_tmpdir
       gmt_remove_tmpdir
       gmt_clean_up [prefix]
       gmt_message message
       gmt_abort message
       gmt_nrecords file(s)
       gmt_nfields string
       gmt_get_field string
       gmt_get_region file(s) [options]
       gmt_get_gridregion file [options]
       gmt_get_map_width -R -J
       gmt_get_map_height -R -J
       gmt_set_psfile file
       gmt_set_framename prefix framenumber
       gmt_set_framenext framenumber

DESCRIPTION

       gmt_shell_functions.sh  provides  a  set  of  functions to Bourne (again) shell scripts in support of GMT.  The calling shell script should
       include the following line, before the functions can be used:

       . gmt_shell_functions.sh

       Once included in a shell script, gmt_shell_functions.sh allows GMT users to do some scripting more easily  than	otherwise.  The  functions
       made available are:

       gmt_init_tmpdir
	      Creates  a  temporary directory in /tmp or (when defined) in the directory specified by the environment variable TMPDIR. The name of
	      the temporary directory is returned as environment variable GMT_TMPDIR. This function also causes GMT to run  in	`isolation  mode',
	      i.e. all temporary files will be created in GMT_TMPDIR and the .gmtdefaults file will not be adjusted.

       gmt_remove_tmpdir
	      Removes the temporary directory and unsets the GMT_TMPDIR environment variable.

       gmt_cleanup
	      Remove all files and directories in which the current process number is part of the file name.  If the optional prefix is given then
	      we also delete all files and directories that begins with the given prefix.

       gmt_message
	      Send a message to standard error.

       gmt_abort
	      Send a message to standard error and exit the shell.

       gmt_nrecords
	      Returns the total number of lines in file(s)

       gmt_nfields
	      Returns the number of fields or words in string

       gmt_get_field
	      Returns the given field in a string. Must pass string between double quotes to preserve it as one item.

       gmt_get_region
	      Returns the region in the form w/e/s/n based on the data in table file(s). Optionally add -Idx/dy to round off the answer.

       gmt_get_gridregion
	      Returns the region in the form w/e/s/n based on the header of a grid file. Optionally add -Idx/dy to round off the answer.

       gmt_map_width
	      Expects the user to give the desired -R -J settings and returns the map width in the current measurement unit.

       gmt_map_height
	      Expects the user to give the desired -R -J settings and returns the map height in the current measurement unit.

       gmt_set_psfile
	      Create the output PostScript file name based on the base name of a given file (usually the script name $0).

       gmt_set_framename
	      Returns a lexically ordered filename stem (i.e., no extension) given the file prefix and the current frame number, using a width	of
	      6 for the integer including leading zeros.  Useful when creating animations and lexically sorted filenames are required.

       gmt_set_framenext
	      Accepts the current frame integer counter and returns the next integer counter.

NOTES

       1.  These functions only work in the bourne shell (sh) and their derivatives (like ash, bash, ksh and zsh).  These functions do not work in
       the C shell (csh) or their derivatives (like tcsh), and cannot be used in DOS batch scripts either.
       2. gmt_shell_functions.sh were first introduced in GMT version 4.2.2 and have since been regularly expanded with other practical  scripting
       short-cuts. If you want to suggest other functions, please do so by mailing to the GMT mailing list: gmt-help@lists.hawaii.edu.

SEE ALSO

       GMT(1), sh(1), bash(1), minmax(1), grdinfo(1)

GMT 4.5.7							    15 Jul 2011 				      GMT_SHELL_FUNCTIONS.SH(1gmt)
All times are GMT -4. The time now is 01:56 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy