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bash/sh: Finding the Length of a Variable (String) in a Shell Script (bash or sh)

Practice



To find the length of a string variable, use this syntax:

{#variableName}

For example:

#!/usr/sh

a="TEST"

# Print the length of the variable $a (will output 4)
echo ${#a}

# Assign the length of the variable to another variable
varlen=${#a}

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Lectures and tutorial on "LINUX operating system"

Terms: LINUX operating system

1. Introduction
2 - System Boot
3 - Linux Help - man
4 - vim, mc, inittab
5 - the appointment of the main directories
6 - directories / proc, / sys. Block and character file devices
7 - regular files and links.
8 - main properties of objects, chown and chmod commands
9 - umask, additional attributes, lsattr, chattr.
10 Users, groups. Passwd, shadow, group files.
11 Linux users and groups
12 - Linux Processes. nice factor. Ps command
13 Signals in Linux
14 - Processes, tasks. Commands fg, bg, jobs, top, nohup
15 - mount file systems. Mount command
16 - / etc / fstab file
17 - Linux Hard Drives
18 - fdisk command
19 - Linux Modules
20 bash interpreter
21 - the basics of bash programming
22 - bash. Cycles and functions
23 - bash. Team unification
24 - bash work with strings
25 - Manage Demons linux
26 - cron daemon and crontab command
27 - syslog service
28 - Linux X server
29 - Linux authentication. PAM system
30 - udev subsystem
31 - Installing programs from source codes
32 Compiler gcc and g ++ for programming in the C language: running code
Unix shell, server technology job interview questions
Unix Mini Cheat Sheet
Linux file system directories
Incron: Scheduling File System Event Handling
Recovery Mode ubuntu - how use?
SWAP UBUNTU setting in file
How to send the contents of a file or its part to the mail from the bash console
Configuring Linux Time Zone
Grouped linux command list Users, files, installation, search, archived and compressed, LAN-WAN
Configuring Linux Networking from the Command Line and GUI
Creating and maintaining a software RAID array in Linux - mdadm
Ubuntu (linux) how to stop the process (kill)? used signals to stop applications
Task and Process Queue Management Systems: Cron, Supervisor, Redis
Updating an Ubuntu Server with sudo apt update, sudo apt upgrade
Temporary failure in name resolution on Ubuntu 20: DNS Issues
Debian: dpkg -i and Automatic Dependency Resolution
Mounting a Windows Shared Folder (SMB Share) in Linux
How to Extract Specific Folders or Files from a tar Archive
How to Find a Disk's UUID in Linux
Installing Xen 4.2 on Debian Squeeze
How to Disable the Firewall (iptables) on CentOS or Red Hat Linux
Debian: Installing a RAID CLI Console on an Intel Server for LSI RAID Fusion MPT
How to Remove an IP Address from a Network Interface in Linux
iptables, DNAT, and How to Reach the Server from Inside Its Own Network
A Mini Cheat Sheet for vi: How to Use It
nslookup: command not found — Where to Get It and How to Install It on Linux
How to Check Network Card Speed and Duplex Mode in Linux
Connecting an Ext3 or Ext2 Disk to Windows
Linux: "umount: Device or resource busy" — How to Force Unmount a Disk
WinSCP: Slow Performance During File Copying
Linux: Autostarting Commands in bash at Login
Unix: How to Find, Delete, or Copy Files Older or Newer Than a Given Time
[+1] Stopped, or How to Bring a Program Back
PuTTY: Working with the Clipboard (Including Inside MC / Midnight Commander)
Console and SSH Complain About the RSA Host Key After Changing Servers or Reinstalling the OS
Debian: Installing Packages and Resolving Dependencies Automatically via apt
Debian / Ubuntu: Searching for Packages and Package Information with apt and aptitude
Debian / Ubuntu / Kubuntu: How to Check the GUI Color Depth
Xen and HVM: Resolution Limited to 800x600 on a Debian (Gnome) HVM Guest with X11
Where Is the IPTABLES Configuration File Located (Default Path)?
Error: "dpkg-source: command not found"
IPTABLES and a Transparent Proxy, or Redirecting Traffic to Another Port
Limiting Bandwidth with Squid (Delay Pools)
Redirecting "2>&1", ">/dev/null", and Output Streams in Unix (bash/sh)
Turning Off Cron (crontab) Email Notifications for stdout and stderr
Debian: Using aptitude (apt-get) Through a Proxy Server
Error: "... must be owned by root and not group or world-writable"
How to View Numeric chmod Permissions for Files and Directories (Like ls with Numeric Codes)
Unix: Aliases for Frequently Used Commands in bash/sh
Unix: File Synchronization or Backup via Rsync (FreeBSD, Debian, CentOS)
sudo: error "sorry, you must have a tty to run sudo"
Xen: How to Boot a Paravirtualized Machine into Single Mode (Linux Debian, CentOS, RedHat)
Xen: Checking the Hardware (Devices) of a Virtual Machine Host (System Configuration)
bash/sh: Finding the Length of a Variable (String) in a Shell Script (bash or sh)
Debian Squeeze: Software RAID-1 Mirror and grub - System Won't Boot from the Second System Disk
Debian/Ubuntu: How to Disable the Switch to Winter (Standard) Time
Where to Get phpize (phpize: command not found) - for Debian, CentOS, Ubuntu or RedHat
SSH: Restricting Access to a Computer (Server) via SSH
Working with tar on Unix (FreeBSD, Debian, CentOS)
sh/bash: A Script for Rotating Backups or Files (Backup with Rotation)
Mounting an NTFS Disk in Linux with Russian (Cyrillic) File or Directory Names
Unix: Converting Files from One Encoding to Another (on Linux and FreeBSD)
Debian - error "locale: Cannot set LC_CTYPE to default locale: No such file or directory"
Working with gz, gzip, or tar.gz Archives
Working with bz2 or tar.bz2 Archives
Converting and Installing RPM Packages as DEB on Linux Debian
How to Change the SSH Port Number (Daemon or Server) in Linux or FreeBSD
Mounting .iso CD Images in Linux (Debian, CentOS, Ubuntu, RHEL)
How to Check Uptime (Time Since Last Boot) in Linux (Debian, CentOS) or FreeBSD
Where to Specify DNS Servers in Unix (Linux, FreeBSD)
sudo - Running as Administrator in Unix (Executing Commands as root in Linux and FreeBSD), the sudoers File
Installing, Removing, and Listing Programs (Packages) in Debian or Ubuntu. Package Management. GPG Keys.
What to Use to Connect via SSH from Windows (Which Utility)
Installing the ProFTPd FTP Server on Linux Debian (or Ubuntu)
Forcibly Ending a User's Session (Kicking or Logging Out a User) in Linux/FreeBSD
How to Change the Language (Locale) in Linux Debian (or Ubuntu)
How to See Who Is Currently Logged In on Linux/BSD and Where This Is Logged
Installing a Paravirtualized Debian Squeeze (Without HVM)
Accurate Time in Debian (NTP)
Xen and Squeeze: the TAP Interface Doesn't Work
Upgrading Debian Lenny to Squeeze
Recursive chmod and chown for Files or Directories Only
Paravirtualized Linux Won't Start: Hangs at the Line XENBUS: Waiting for devices to initialise
Paravirtualized Debian Only Boots Up to the Message "Starting local scripts"
Converting Debian Squeeze to PV Xen (or Installing PV Debian)
Linux Password Files
Xen: Internal Dummy Virtual Network in Debian
Building .deb Packages from Source (Debian)
Installing Xen 4 on Debian Squeeze
Disabling or Configuring Automatic Filesystem Checks in Debian or Ubuntu
Adding a Second HDD in Debian and Ubuntu
Date, Time, and Time Zone in Debian and Ubuntu
Backports in Debian
Installing VMware Server on Debian Lenny
Unix: Finding Out Which Program Is Using a TCP Port
Installing Xen 4 on Debian Lenny
Installing Debian Lenny PV (Paravirtualized) under Xen
Bash/sh: Reading a Specific Line from a Text File (by Line Number)
bash/sh: Progress Bar While a Script or Command Runs ("Please Wait" Animation)
bash/sh: How to Determine the Number of Days in the Current Month in a Script
bash/sh: sed and the Newline Character \n
bash/sh: Replacing Characters or Substrings in a String in Shell Scripts
Reverse GREP: removing lines that contain specific text
Variables - environment, shell, and dynamic bash/sh: creating and using them in shell scripts
bash/sh: special variables (exit code, pid, startup parameters, etc.)
bash/sh: extracting a substring bounded by given characters (a delimiter) from a string in scripts
bash/sh: if conditional statements and their structure (equality/inequality, greater than and less than, etc.)
FreeBSD: Installing a Samba file server in a Windows domain (Active Directory)
How to check the version and name of your Linux distribution
bash/sh: Reading a file line by line in a shell script
Samba: warning "rlimit_max: rlimit_max (1024) below minimum Windows limit (16384)"
Running a shell script as a background process
Installing EPEL on CentOS 5 (RedHat)
Installing an SSL certificate for Apache from Let's Encrypt
Squid not listening on any port
Garbled characters (mojibake) in Midnight Commander (mc)
Recursively renaming file extensions in Ubuntu
cp: cannot create regular file '/media/user/backup/backup_2018-03-26_01:46.tar.gz': Invalid argument
Ubuntu Software not working correctly [solved]