The Almquist shell is a variant of the Bourne Shell

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1answer
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Start sh in a specified directory from inittab

I am currently working on an embedded Linux system. For it to be similar to our other products I need to have it start a shell in a specified directory on boot, accessible using the serial port. For ...
0
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1answer
33 views

Checking the schedule of a cronjob and doing a conditional check on specific parts

Edit: I managed to solve this myself, I actually deleted my original question as I was over complicating the process slightly, but have since answered it in case others find it useful. RegExp is not ...
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3answers
330 views

RegExp testing with ash shell (BusyBox)

I need to do a RegExp pattern test on a certain bit of user input. This is the pattern I need to test the value against. ^([a-z]{2,3})\-([a-z][a-z]*[0-9]*)\-(\d+)$ An example match would be: ...
0
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6answers
132 views

How can I filter out a specific part of a JSON response in ash shell

I'm using wget with -qO to a specific updater URL for OpenELEC which provides the following JSON response, similar to the one below. ...
0
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2answers
200 views

ffmpeg batch convert .avi to .mp4 - in ash

I'm looking to batch-convert a directory (or several) of video files from .avi to .mp4 containers, just copying the video and audio streams across. I know the ffmpeg command to do this, and have no ...
1
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1answer
102 views

Ash profile/configuration file

I am looking for a way to customize Ash sessions with my own sets of aliases and whatnots. What is the Ash equivalent of Bash's bashrc files?
2
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1answer
358 views

History in the Almquist shell in the NetBSD

In NetBSD /bin/sh is a modified version of the Almquist shell. With the command fc -l it is possible to view the last 16 commands typed in the prompt in the current session and not the older ones. ...
14
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1answer
523 views

Percent in $PATH environment variable

My $PATH looks like this: ...
2
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1answer
523 views

Regex doesn't work with grep

I have a string like this TEST="/dev/sda1 on /media/sda1 type vfat (rw,relatime,fmask=0000,dmask=0000,allow_utime=0022,codepage=cp437,iocharset=iso8859-1,quiet)" (Result from mount | grep sda1) ...
0
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1answer
1k views

How to write simple if condition in ash?

I would like to write a small script that would check every once in a while if I have the internet connection. I would like to run it in crontab on my router where I have ash. I am having a hard ...
3
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0answers
612 views

Number comparisons in BusyBox ash

I have the following script that extracts data from the EXIF command on my BusyBox ash-based system. I parse the date tag from the end of the file and use case as a final check to ensure the format ...
2
votes
2answers
2k views

Busybox ash script does not exit cleanly after executing cat; unable to get exit code

Consider the following script wrapcat.sh (a wrapper for cat) for illustrative purposes. It is run with busybox (ash) in an embedded Linux 2.6 box. #!/bin/sh cat $1 Under certain circumstances, this ...
2
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1answer
2k views

Using BASH versus ASH on Synology

The majority of my photo files have the following naming convention / format IMG_20131204_120000.JPG, showing date and time the photo was taken (iPhone/Apple naming convention). However, not all my ...
3
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1answer
800 views

Need to improve urlencode function

I need a way to URL encode strings with a shell script on a OpenWRT device running old version of busybox. Right now I ended up with the following code: urlencode() { echo "$@" | awk -v ORS="" '{ ...
9
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1answer
2k views

Are dash, ash and sh script 100% compatible?

I wanted to know whether scripts written for dash, ash, and sh are 100% compatible? Are there any added features to dash or ash, or syntax change? From what I heard, ash is a direct descendant of ...
0
votes
2answers
3k views

Why does this incrementing for loop return a bad variable?

I'm trying to call this shell script from within the CLI of GRASS GIS: for (( day=5; day<367; day+5 )); do # commands that I've tested without a loop. done exit 0 returns Syntax error: Bad ...
29
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1answer
1k views

Avoiding “BASH-isms” in shell scripts

Does there exist a tool similar to Perl::Critic that will inspect your shell scripts and point out flaws, portability issues, uses of non-standard programs without fallbacks, depreciated program uses, ...