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Top Forums Shell Programming and Scripting I want to add a variable for the results from the formula of one variable and results of another var Post 303030998 by Ibrahim A on Wednesday 20th of February 2019 10:19:33 AM
Old 02-20-2019
I want to add a variable for the results from the formula of one variable and results of another var

Good morning all,

This is the file name in question OD_Orders_2019-02-19.csv

I am trying to create a bash script to read into files with yesterdays date on the file name while retaining the rest of the files name. I would like for $y to equal, the name of the file with a formula output with the exact date in the middle. So far this is what I have:

To get yesterdays date in the correct format, I made x:

Code:
x="date -d yesterday +%Y-%m-%d"

y="OD_Orders_$x.csv"

This issue with this is that the results when I do a echo $y gives me this: OD_Orders_date -d yesterday +%Y-%m-%d.csv

Can someone please tell me how I can show the value of $x when echo $y correctly without it showing the formula? I need $y to input the filename with yesterdays date in the correct format because I want to use it more later on within this script.




Moderator's Comments:
Mod Comment Please use CODE tags as required by forum rules!

Last edited by RudiC; 02-20-2019 at 11:34 AM.. Reason: Added CODE tags.
 

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SCRIPT(1)							   User Commands							 SCRIPT(1)

NAME
script -- make typescript of terminal session SYNOPSIS
script [-a] [-c command] [-e] [-f] [-q] [-t[=file]] [-V] [-h] [file] DESCRIPTION
script makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. Options: -a, --append Append the output to file or typescript, retaining the prior contents. -c, --command command Run the command rather than an interactive shell. This makes it easy for a script to capture the output of a program that behaves differently when its stdout is not a tty. -e, --return Return the exit code of the child process. Uses the same format as bash termination on signal termination exit code is 128+n. -f, --flush Flush output after each write. This is nice for telecooperation: one person does `mkfifo foo; script -f foo', and another can super- vise real-time what is being done using `cat foo'. --force Allow the default output destination, i.e. the typescript file, to be a hard or symbolic link. The command will follow a symbolic link. -q, --quiet Be quiet. -t, --timing[=file] Output timing data to standard error, or to file when given. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays. -V, --version Output version information and exit. -h, --help Output help and exit. The script ends when the forked shell exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. Script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism), scriptreplay(1). HISTORY
The script command appeared in 3.0BSD. BUGS
Script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. AVAILABILITY
The script command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. util-linux February 2011 util-linux
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