Questions tagged [eval]

Question 1

In the shell I can do $ a=b b=c; eval echo \$$a c How do I do the same with GNU Make's $(eval) function? $ cat Makefile a=b b=c x:; echo {What goes here in order to get:} $ make c

Question 2

...that is to say, is there a means by which I can read the full command that's being evaluated AS it's happening? Here's a contrived example, but one I feel makes the question clear: function ...

Question 3

I'm writing a shell script that changes its behavior based on the number of positional parameters passed script.sh if [ $# -eq 1 ]; then if [ -f "$1" ]; then validate='validate <&...

Question 4

I am writing a script to move around a bit of data, which I want to be able to create the parent directory to where I am sending my data, in order to do some renaming/cleaning of filenames I need to ...

Question 5

I'm trying to do a db backup script using Bash. When adding a "Resume" feature to the script, I do the following loop calling defined functions to do step by step (depending on the .lock ...

Question 6

I run a game from steam which starts with the game companies launcher app where I have to click another button to start the actual game. The game launcher is very slow, contains needless advertising, ...

Question 7

In bash 5.0, I wish to capture the ${PIPESTATUS[@]} of a piped command that is executed via eval. However, eval appears to mask ${PIPESTATUS[@]}, but doesn't mask $? which is the equivalent to ${...

Question 8

Looking at a bash-script that takes input from Git commit comment to update itself. Simplified: script: #!/bin/bash comment='' printf '%s\n' "$comment" upgrade_script() { # ...

Question 9

In a bash script: jenkins_folder=`cut -d "|" -f1 -s input.csv` jenkins_url='https://url.com:8181/jenkins/view/' echo "jenkins_folder : ${jenkins_folder}" for job in ...

Question 10

I want a script to make awk to become an interactive mathematical calculator, to eval mathematical expressions given in each line. I.e., instead of constructing awk commands to calculate expressions ...

Question 11

I am trying to automate adding Homebrew to my path in a shell script, but these two lines do not evaluate inside my shell script: #!/bin/sh eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)&...

Question 12

I'd like to use a variable variablenaam for using in a loop. I tried for hours but can't make it work. My experiment in bash on a RPi 4 with the latest Raspbian. I like to make the use of xstack1 and ...

Question 13

There is a way to declare variable in eval ? For example function test { eval $1 } test " value="foo" echo "$value" " But it display nothing. ...

Question 14

Becuase I need to make sure I run authentication for my nohup commands I need the real command I want to run to be in a string in here: nohup sh -c 'echo $SU_PASSWORD | /afs/cs/software/bin/reauth; ...

Question 15

How to wrap a command to measure its elapsed time? Currently I do it using eval: do_cmd_named() { local name=$1 local cmd=$2 echo "$name" local start_time=$(date +%s) eval "$...

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Questions tagged [eval]

How to do indirect variable substitution in a GNU Makefile?

In Bash 5.2+, is there a means to read the command currently being evaluated?

How to properly make eval safe?

eval for pathnames from mkdir -p

While Loop Exits After Calling Function [duplicate]

Confusing results of eval + sed combination [closed]

eval: $? vs ${PIPESTATUS[@]} (bash)

Sanitize input that is used to update script

Shell script: Using variables makes command fails ( substituting values of variables manually ; command works fine )

awk or perl to eval mathematical expressions in each line

Command output evaluation not working in Bash script [duplicate]

use a variable as a variable

Declare variable in eval Bash

How does one store the evaluation of a big string with multiple env variables $VAR into another env variable?

Bash: how to wrap a command to measure its elapsed time?

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